Considering the sky itself is “fake”, there is no reason to believe the floating formation we see in said sky is really Celestia. If celestia is as taboo to speak about as it seems going by how vague the archons tend to be when discussing it, then just pointing up at some floating rocks in the sky and calling it Celestia can be an easy to use misdirect.

0:11 "seemingly infinite area" Me who takes minutes in the loading screen: I concur.

Theory: scaramouche said the sky is fake. So what if the sky we see at the start of the game is actually the real sky, and the clouds are the fake sky that covers the real one up. It may also be that celestia uses the pillars to hold up the sky and can drop a pillar like a missile whenever want to.

I think Celestia will be technologically advanced, with machines with more sleek designs compared to the ruin machines of Khaenri'ah. This is because of the Shogun Puppet, since the means to create her were not new. The pillars in the sky can definitely be the Heavenly Realm long abandoned after the loss of the primordial one, now it is a border where outlanders can enter and exit Teyvat.

Thanks for the new information! I would have never been able to arrived that the conclusion that Teyvat is an area sealed off by the Celestia gods, since exiting it is forbidden.

I personally feel that could be the realm between all the worlds. The twins were trying to escape tevyat and go into another world. I personally think it wouldn't make sense if they go into the heaven realm. So the gate could also mean that the twins are 're-entering' teyvat. It could also be theorized that the gaps between the pillars are pockets between the worlds and the twins dropped down in one specific pocket which would make sense why they were perhaps meteors ? This is probably highly inaccurate and your theory does sound more plausible haha

Personally I believe this place is the Celestial Atlas, the one Zhongli mentioned in his story quest Like a Gateway between worlds so to say

I just noticed that when the cutscene started where the twins were in a meteor, they flew over the *present* teyvat and not 500 years ago during the cataclysm. Does this mean our twin was sent to the past, instead of us being sent to the future?

A really similar place is recently added in Honkai and it's not called Celestia so that's that. Edit:- This can also be the gateway to travel to another world aka the gate of this world. It was also mentioned by a youtuber named Wei. According to Norse Cosmetology all the universes are branches of the "Imaginary Tree" or Irminsul tree and there is a gateway to travel between each of them. Also, here's something interesting:- We haven't seen any God or any higher entity with a crown but Paimon wears one and the symbol on her crown represents the Yagdrisl tree.

I think that the loading screen is the gateway between worlds. We see it in the opening cutscene when the twins are trying to leave Teyvat and go onto the next world, and it’s also the loading screen. It’s like every time we open up the game again we tried to leave Teyvat and managed to get back to that place but we keep getting to the same door every single time. I think that there’s more doors on the loading screen that lead to other worlds but we can’t access them yet. If you think about it, it would be a great way to keep the game going and would even explain why the game trailer says “Teyvat Chapter”. Lemme know what you think :)

Now that I’m looking closer at the sprite of the floating island, the structure looks like a larger version of Dainichi Mikoshi. Since we know that the Dainichi Mikoshi can be turned on and off, I wonder if this structure can as well, and whether this function has something to do with the false sky that Scaramouche mentioned.

I never thought it was Celestia because it lacked “building” buildings. My initial thought was it’s like crossways between worlds. In the opening, it seemed like they were about to leave the world they were just in to the next. They might have come close to Teyvat gateway, or was the world they were going to. Before they can leave or enter, they were stopped by the Sustainer to punish them. I don’t think world jumping is the transgression. If so, Alice would also be a convict. I think their existence is what goes against their Heavenly Principles. As stated before, all must are to be affected by erosion. But the twins might be unaffected by erosion. Hence, why the Sustainer attacked them. Why they’re not being hunted, I don’t know, but they also don’t have all their powers back and are trapped in Teyvat. Maybe this is a way for Celestia to keep an eye on them. Hold them on their domain.

1:43 I’m quite sure that Venti also confirms the existence of lakes or other water bodies in Celestia in one of his voicelines, where he talks about how foul the water the water there tastes, and how bland the fruit is.

One connection we see between 'heaven' and Celestia is the gold symbol shared between the heavenly pillars and the statues of the seven. Oddly enough, it's also a symbol littered all over Paimon.

I hope i can come back to this video when Celestia is finally explorable or at least have more lore, just need to wait a few more years.

It does make sense if we think about how the doors open to us whenever we log in. Where exactly do we enter to as our default location after that? Right, to Teyvat. The same thing happens when we log out and we're brought back to the heavenly area possibly to then "exit" Teyvat.

To me, the architecture of Celestia looks a bit futuristic(?), and I personally think it might not be from Teyvat. Since there’s lots of theories mentioning that the world of Honkai and Genshin are connected, it may be possible that Celestia may have something to do with Honkai. The world of Honkai looks a bit futuristic (at least the buildings and technology does), so this floating island in the sky known as Celestia may be from the world of Honkai Impact. I won’t be that surprised if Celestia has some connections with Honkai, as some other theories I’ve seen mentioned “Project A.R.K.” from Honkai. Try searching it up if you’d like to check it out. Since Project A.R.K. is searching from world to world (just like the twins) for a new place for humanity, it may have found Teyvat during their search. It may have somehow influenced Teyvat when it was found. I’m not sure if Celestia is directly from Project A.R.K., but it may be a possibility. Something else I’d like to point out is the archons from Celestia. I noticed so far that almost all of the archons’ physical appearances and even their names are extremely similar to the herrschers from Honkai Impact. Venti reminds me of Wendy, the herrscher of wind from Honkai, and Raiden Ei reminds me of Raiden Mei, the herrscher of thunder from Honkai Impact. The pyro archon’s name is Murata, which also happens to be Himeko Murata’s, possibly the herrscher of fire’s name. Even the unknown god from the beginning of the game reminds me of the herrscher of the void. I’m not sure if there is a herrscher that looks similar to Zhongli, but so far I have not discovered any. If all of them are connected to Celestia, the chances of Celestia is somehow related to Honkai is bigger. It could be possible that when Celestia was choosing its archons, maybe they transported some sort of power like and/or from the herrschers. The celestial gnosises given to the archons could be that “power” granted to them(?). Of course, this all might just be a coincidence or an Easter egg as Venti CHOSE to take the form of his deceased friend. But who knows? Knowing mihoyo, I heavily doubt this is all purely a coincidence or just an Easter egg/design made by mihoyo because they are the company of both games. Plus, Yae Miko reminds me of Yae Sakura, despite Miko not being an archon and Sakura not being a herrscher. So a character from genshin’s physical appearance being very similar to a character from Honkai may mean something we do not know yet. Thank you for taking the time to read! Of course, some parts may be inaccurate, so please correct me if it is! :]

Genshin lore can more fascinating than some of the best animes. I cant wait to see how they'll tie in Honkai and other mihayo universes to all this

Maybe that's the realm where primordial one and second one started a war

You know what would be interesting? If the start screen and the place where they’re fought the sustainer actually doesn’t belong to the world of Teyvat. What if its an Endless „sky above the clouds“ where the twins could enter any world they’re desire? Maybe the sustainer is a guardian of the worlds and doesn’t allow the twins to enter other worlds and change them by the twins desire. (I don’t have any evidence, but maybe evil twin woke up first, created Khaenriah, saw it destroyed, since it doesn’t belong to Teyvat, woke up the main traveler, tried to run, sustainer stopped them by the chaos the evil twin did,

It looks more like enkanomiya. It is a domain. As if the sustainer domain also holds the entrance and exit to teyvat

what if, Teyvat is just a painting by Griseo and made to life by Aponia

as for me, when the twins trying to leave, it is possible that was the ending of their journey and trying to leave the world of Teyvat. Thats when the sustainer stops them.

I think its like station between worlds, like a train station but instead of trains its doors or gates. The door that we are going through every start of the game are the gates going to Teyvat. Like that one scene on Nightmare Before Christmas where there's doors for every holiday.

I personally think that the "Heaven Realm" is actually the place which connects all worlds, like a network. The gate that we see when opening the game, can be gates to all the worlds, as in every world has this gate that needs to be entered and that gate is accessible through the heaven realm. A network connecting all worlds together, holding gates to each world.

I swear when we finish Genshin, I'll come back to these kind of theories and videos.

5:36 its possible that celestia might be trying to mimic heaven realm created by the primordial one

my theory : Teyvat is earth with a fake sky, celestia are the aliens/unknown who want to take control over all teyvat as a "god". Fatui/tsaritsa and celestia hate each other. Kaenriah/abbys order are the indigenous of teyvat (former people before all seven nations people) Loading screens is a bridge to heaven/travelers real destination *sorry for bad grammar :/ + idk if it didn't make sense, but now i still trust this.

as you said in the end, it's a realm to pass through. I agree the place we see in the beginning isn't Celestia. There was a screenshot of a feline character in honkai recently, i think one of the flamechasers, with a star in the background similar to the traveler's in the background and staying in a place similar to the realm we go through in the intro. maybe it's related to that.

What if the starting screen area is khaenri'ah before it was destroyed? Because we also started our journey there when the sustainer sent the other twin to a place that was destroyed from here only and we woke up after the other one and in teyvat. Not so sure.

In Enkanomiya there was this portal that you had to go through to get to the floating islands, if you didn't use the portal all you could see is the initial area. I think Celestia is like that, when you don't go through a portal it is limited in space, but once you do its area extends (infinitely?). So I think the travelers are indeed in Celestia.

Dainslief once said, once you finish your journey, the is final doorway. Maybe the floating island is the final doorway to unlock the world mystery

Do remember that the Lumine trailer exists, where the place the twins got separated starts falling apart, the "endless sky". The floating islands that we see today could very likely be the last resemblance of the "endless sky". Likely after the destruction, which could've happened during the time when Khaenri'ah gets destroyed along with the "endless sky" (with the pillars), the Unknown Goddess defied someone of a higher being to destroy Khaenri'ah. Leading to the destruction of 2 areas with the destruction of the "endless sky" caused by the destruction of Khaenri'ah. The Sustainer of Heavenly Principles probably broke a rule between the interaction of mankind via destruction of Khaenri'ah, and perhaps something to do with Raiden Makoto.

I really love watching your videos, keep up the amazing work cat :D

🌸🌹I am most inclined to concur, and utter “what exactly was this place”?🌹🌸

I bet that place is, like you said, some kind af gateway between worlds, for that reason we, the players, have to enter to the game, to Teyvat, through the very same place.

i think we will reach this place after celestia arc, bcs we know that the traveler sibling is still at abyss side and looking for a way to kinda revenge to celestia atm but in that cutscene which is also our starting cutscene, they are fight together. for why they is not stopped when arrived but stopped at leaving, I think because the celestia thinks that the twin is interfering too much with their plan on how they shaping teyvat and its people

The loading screen is the celestial atlas btw! It is located waaay above mondstadt and higher than celestia. hope this helps

the start menu is the bifrost, a bridge connected to different realms. the sustainer of heavenly principles is basically heimdall.

That might be the gate lead to Celestia, like the gate that open a secret tunnel to Enkanomiya

WAIT AT THE BEGINNING THE CUTSCENE SYNCED SO WELL WITH THE MUSIC WHAT

Pretty sure that the infinite sky pillar area in the loading screen is simply the "place between worlds", since every time you load the game you walk down the path, open the door and "enter Teyvat". So this place is the means by which the Travelers use to get from one world to another.

I see the 'loading screen' like the Genshin Impact version of the Honkai Impact's Sea of Quanta, a Nexus between worlds. In fact it makes sense to be the starting screen of the game because is what we use to go from our real world to the world of Teyvat.

Im sure the login screen is the realm between realm like in the god of war. The sustainer was trying to stop the twins getting out from teyvat. The reason still unknown

Happy Holi 🎉🎉 ❤️🔥 Keep up with your cool works!!

At this point I think the loading screen is like that area from Monster Inc. where there are numerous doors and passing through the doors, you can visit infinite worlds. I actually had thought of it in fun before, but now after this video it feels more concrete, thanks for the video! *-*

Your videos makes me want to read the manga even more! Edit: That Ruu soundtrack at the end gives me chills

The point in the sky is definitely related to the end game. If you go to place in mondstadt related to the god of time and check the arrow. Check where it points its always that island in the sky. If you check on the map it always points at the start point of the story and that island. If you read the information about the first statue of the seven it hints of the god of time and always mentions the start and end of the journey.

i remember way back in like 2.0 i had this theory that this area was how the twins traveled worlds, like a place in between worlds not a teyvatian thing. the pillars have celestial motifs but celestia is also outlanders so it makes sense

0:09 𝘀𝘂𝘀tainer

I hope we get to learn major details about teyvat when we reach Sumeru where most of the smartest people are. scholars and teachers alike should at least know something above teyvat that anyone can see.

I'd say this is the border of the tyvat , you see in the opening section of the game, it ends by a portal, that leads to Tyvat , so the siblings were probably crossing the borders through the sky cuz they're traveling the stellar sea, I heard from a different video that the shape of tyvat could be himosphere, meaning it's a land surrounded by a barrier located in a huge ocean, which gives it a himospheric shape. So I'm pretty sure it's the edges of tyvat.

Say, what if it is the bridge between universes ?

Yo creo que cuando encontremos el último pilar que está bajo agua (quizás) podamos ver a Celestia, hasta entonces tenemos que esperar a que habiliten todo la parte norte. Estos pilares son especiales, capaz que por eso tienen esa roca azúl, además en Inazuma, los murales muestran que hacían una especie de ritual a la luna y los pilares hacían que hiciera un tipo de destello o algo la luna, en Sima el pilar se carga y brilla. Todavía tengo muchas dudas respecto a ellos, están incompletos, en Sima, si mal no recuerdo hay una parte donde un npc dijo que "es como si sus partes se buscarán para completarse", en fin habrá que verlo más adelante. Pero lo que si es que le estamos dejando hacer lo que quiera a hoyoverso con nuestro tiempo, muchos juegos hacen la misma estrategia que ellos pero ya se pasan.

At the start of the game, when the game is loading, we can see we are "walking" Towards a door that appears. I suppose this is a division between realms, which would make sense, considered Honkai is set in the same MULTIVERSE and not UNIVERSE, meaning you enter the other realms here. Funny idea I thought of is what if the twins were stopped from entering Honkai bwahah. It's just a funny idea. The key to finding out where that place is is probably lying in why we weren't allowed to progress to another placr.

It should be noted that in the second quest we see Dainsleif, the traveler comments about their encounter with the unknown god and how before she intercepted the twins the traveler saw the destruction of a nation, of which both them and Dainsleif believe was Khaenri'ah.

In Hobkai there's concept called the sea of quanta, it shapes itself to match the person who's looking at it. And it's also a gateway to other worlds. Maybe this place that we start the game is the sea of quanta or something similar to it?

I feel that they could be the ruins of Khanreia'ah, as they didn't really have a reason to go to that 'heaven' either. Innstead, they were trying to flee from Khanreia'ah after its destruction. And if you'll notice, then several of the structures that appear while loading the game are broken or ruined, etc.

In the opening loading screen at the toppity top you can see something looking similar to celestia

I think it's the uppermost border between teyvat and other parts of the sea of quanta As it's entirely possible Teyvat is simply one of many worlds as Otto saw it while peeking into said sea of quanta & finding a kind of yggdrasil style world tree

3:44 Venti mentions Celestia in one of his voice line

you can find the start menu area above the big statue in mondstadt watched a video on it awhile back was some dude with mods

It’s interesting how the skinny pillars from the start screen have leaf like design wrapped around it on the top n bottom the same leaf like design is also seen wrapped around the statues of the seven maybe the statues are created wherever that place is🤔

man i love this channel

@CatWithBlueHat in a vid made by Bob And Mora where he/she goes to Celestia but the place looks to really the place in the loading screen; also someone in the comments of that vid said that they can see Celestia floating amongst the clouds somewhere on the loading screen.

Apart from the clue that, that “heavenly place”, is something you need to pass through in order to go to another world, we have to pay attention to how the twin in the first cutscene, described how they came here. “Fell”, while this could be paimon misunderstanding, or just using another word, you can always just use “came” or “travelled”. This means something mustve happened in the prev world. “You fell here from another world, but when you wanted to leave, some unknown god stopped you?”. The other twin waking up earlier than the traveller point that when they fell here, they lost consciousness. If the twin woke up much earlier than the traveller, why did they not wake up the traveller? Was there something that prevented the traveller from waking up, or being woken up? If the traveller woke up after the destruction of khaen’riah (forgive my spelling”, is ‘some unknown god stopped you’ connected with the other twin? If the other twin knew Dainsleif, enough to even be traveling together, is the twin somewhat connected to the royal family? Say the twin did a huge contribution to the development of khaen’ria, does that mean the unknown god stopped the twins from going to another world, to take the twin? Im hella confused. Why did paimon say “Fell from another world”, what is the relationship between dainsleif and the twin? Is the twin connected to the fallen nation, the reason why they were taken? What exactly made the people of that fallen nation, transform to what we know today as hilichurls? My brain hurts.

1.- Paimon. 2.- Manga Honkai 2nd Key: Avalon. 3.- Los gemelos llegaron en meteoritos directamente a una "civilización subterránea": Khaenri'ah. 4.- La misma luna se puede ver, más pequeña en Teyvat, mediana desde la pantalla de inicio, y grande en algunos dominios, y el Corredor del Abismo. 5.- En el juego, la luna pasa sobre Celestia. No puedo afirmar lo mismo del sol, ya que me quedo ciego. Pero no sé si se puede decir, que este detalle es a propósito, o por recursos del juego. No he escrito en inglés, pero me parece que el traductor me traducirá bastante bien.

I always saw the heaven area as a hub-like space between worlds since the twins go through it to leave Teyvat

maybe the place where the game starts in like the realm that connects differents worlds, taking that the twins travel through different worlds

From doing the travel journal quest in Inazuma, we learn some "half-fake information" that Fontaine is an area in the clouds. So I was guessing that maybe it's the undeveloped Fontaine that might have a giant pool of water underneath and long water falls that falls to it. Or Maybe it may have a direct link to Sumeru and supplies them with a water source. The God's could possibly be at odds and a world quest maybe to create that harmony. Either way, if that was the concept I'd be excited. Maybe the higher into the "sky" we go is the more we'll see Fontaine's land.

IMO probably that place the twins fought Sustainer is a some kind of "gate" or "checkpoint" boundaries or like that, you know when we want to go out to other countries usually only 1 or 2 airports that allowed to do so. And since Archons are inhabitants of Teyvat, they didn't really know or doesn't have any knowledge or desires to go there and beyond

I always thought the opening screen is like the real whole/universe, the door we enter is like entering a domain but on a grander scale, meaning other doors lead to other worlds. When we tried to escape, we exit from this said door but was confronted the the UK god, because we breach traveling regulations, thus she sent us back until we can show proper identifications that we are certified to travel worlds lol

I think this realm with the pilliars is simply a gateway between many different worlds. Since the twins were expierenced and powerful travellers between these worlds. But they got ambushed in this space by someone even more powerful and were forced to stay in Tevyat. I wouldn't be suprised if beyond that realm there would be even more powerful and ancient beings then the sustainer.

I believe that it’s like portal or something to enter Teyvat.

imagine if CatWithBlueHat and Wei combine together all of their theories with everything that they found that would be hella crazy

The place was the old stormterrors lair which is ventis fort

The place where we get caught looks more like elysian realm from honkai and that place might be the edge of teyvat which kinda make sense since traveler is trying to run away from it

SEGA unofficially codeveloped Genshin. Celestia resembled Sonic the Hedgehog's Sonic Riders' Babylon Garden / Space Babylon (a spaceship). Dragonspine is a former spaceport / dimensional port. They also did My Little Pony. Raiden's Shogun resemblances to Twilight Sparkle (& Raiden Mei), including Miyuki Sawashiro as their JP VA are related. "Ei" meaning "Shadow" is related to Twilight being Shadow the Hedgehog's daughter. (See also Final Fantasy XV's Noctis Lucis Caelum) Kikuko Inoue voiced for Celestia & Alice. See also Secret Space Program.

8 islands for each of the elements (including Paimon aka archon of time!) (possibly 8 statues too, with one each being in Teyvat, Stateus of the Seven is called like that because Paimon did not get her own, possibly because she did something against The unknown god, like help Makoto save Inazuma, helped her protect Ei so she won't die, and helped her plant the tree in the past? Travellers were... well.. Travellers, from another world. Fake sky is some kind of barrier which closes off Teyvat from rest of the...world?timeline? They were travelling and when they enteret Teyvat, they were passing trough and once they entered, they couldnt live because they were stopped by realm of gods? Something we see in first cutscene and when we log into the game? Celestia might be portal to that world, and having 8 gnosises gives you power to enter the realm and fight a god (very similiar idea to No Game No Life). When you pull in the banner you literally summon people from another worlds/timelines, thus the falling stars. Tsarista and Harbringers wish is to literally fight the god. I believe The god, destroyed people of Khaenri'ah because there were known to not believe in any god like figiure and they were the most advanced race.

This cat and it's theories! I love it

I would take a guess that the heaven realm is a kind of subspace realm where "planeswalkers" like the twins use it like some sort of inter-dimensional pathway to travel to different worlds. and yeah the bit that we start the game from a door leading out of the heaven realm certainly correlates to this idea. there could be countless other doors from different paths all leading to different worlds, maybe one leading to the Honkai 3rd earth too :D Honkai Star Rail is already expanding on the multiverse theory that Honkai 3rd started with the Imaginary Tree.

i was waiting for this one

I always thought Teyvat is under a dome, and the loading screen is the entrance of this dome.

That would make sense that they were trying to leave, because if you think about it, when you start the game.. You have the door when if you click your game loads.. So that would make sense that the door in the start screen could be called a gate to another world lorewise

My understanding was that at the top of the tower would be a door that doesn't follow 3D space, like a portal that you open and you would see the infinite expanse before you. Scaramouche also said the sky was fake so it could be a giant sky box and the island is just the part of Celestia that peeks into Teyvat.

I am pretty sure the Celestia we see in the sky is not a 3D model, rather just a floating sprite. I assume it's a placeholder just like the Dragonspine mountain, Inazuma islands, or even The Chasm's current in-game form. And when the time comes for us to finally go there, we may see Celestia that's similar in overall shape but very different in details.

All theory in Genshin go BRUH

HM. About the inside of the Celestial Nails containing that blue stuff... Maybe the Celestia we see in the sky was a kingdom of a god-king (like Deshret or Remus) who could access the leylines. Leyline power is blue. So, in an attempt to get closer to the Heaven Realm, that god-king created the Celestia island and empowered it with the memories/souls of the leylines, which allowed it to hover, like the machines of Deshret's kingdom. It broke free of the ground of Teyvat and has been in the sky ever since, occasionally dropping its pillars on places.

and we might also see that pillar again in version 2.6 where chasm is released

imo the place where twins fought with sustainer is a main gate to access teyvat’s world from outside and inside

I mean It area we see could also be a gate leading to different worlds but I think this area definitely is the area you discribed

Thank you for clearing it up. Man, how many realms are there? Human, Vishap/Light, Abyss, Heaven? Are there more?

Thank u for the video! U are doing an amazing work❤️ I have a suggestion for you. In one of Raiden Shogun voice lines, she says that she is not responsible if electro visions aren’t been given. She says that’s two things that makes a vision be granted… BUT kujou sara says that her vision was granted by Raiden Shogun herself… so the archons can give visions or they can’t? (I from Brazil, so I’m sorry if my English is not good. I tried my best)

The loading screen is just an aesthetic choice though. In the scenes with the Unknown God we see that there are indeed limits and an ending point. Several are shown in this video.......it doesn't actually go on endlessly. 🙃 Edit: 0:27 there's a very clear ledge that the twins land on. 2:56 you can clearly see that the pillars stop here. 3:57 again, you can clearly see that the pillars don't go on forever and there's just clouds. Which, it could have just been extra cloudy that day.

celestia is the land we see up in the sky in game, in the genshin comic they show this and talk about it and theres 2 murals in game that depict it as well, confirming it is. also nahida seeking knowledge about it from the doctor referring to ‘the sky’ and specifically talking about celestia itself while threatening that breaking a gnosis will awaken the heavenly principles (celestia) confirms it too.

well I also not really sure what's the view once we arrived at that floating island. just like Seirai island, for example : when you arrived at Seirai island, the place are surrounded by dark clouds and thunder. but when you're at asase shrine, the view has change, you can clearly see the whole seirai island.

In the clip describing the structures in celestia i realized it kinda looks like enkanomiya

I think it's not the heavenly realm but it's the sky kingdom or rather part of the sky kingdom. There are mentions in 2.5 in enkanomiya quest about the "sky kingdom among the heavens". It was also mentioned in the bp cutscene about the "sky kingdom among the heavens" . I do not have much evidence to support the theory aside from enkanomiya is part of the sky kingdom that which fell into the darkness. The structure of Enkanomiya islands look as if it's always been floating. And I do think it's not a coincidence that it has similar pillar structure to celestia. I do think that celestia was once part of the "sky kingdom". The architectural structure of celestial as seen have visible similarities to enkanomiya (which was once part of the sky kingdom/one unified civilization). However compared to enkanomiya, celestia have more modernish architectural structure as especially when we compare the pillars from the one in the loading screen and the one from celestia. So similar yet so different. So I've come to a conclusion that celestia was once part of the sky kingdom/1st civilization but celestial gods/2nd who came and his followers (maybe) probably stole it after winning the battle. Well just my theory. About what i said "the 2nd who came winning the battle". The primordial one winning is just what the enkanomiyan's assume. I'm obviously not the convinced with "primordial one defeated the 2nd who came" because it's honestly weird how they want to hide everything related to the primordial one or the moon sisters. And the fact that the history about the moon sisters is nothing but a myth in current teyvat (even the adepti don't believe in it) when it was true. They even want anyone who knows about it and the ancient disaster dead. Just to add about this place being part of the sky kingdom in my theory. At first, just like some in the community thinks it's the lunar palace, i realized that it cannot be the lunar palace. It was mentioned in kunwu's wyrmbane lore (unrelease weapon) (genshin.honeyhunterworld.com/db/weapon/w_4403/?lang=EN) that the lunar palace is on the moon and as I've mentioned before the sky kingodm is among the heavens. It was also mentioned in moonlit bamboo forest vol 3 (genshin-impact.fandom.com/wiki/Moonlit_Bamboo_Forest#Vol._3) that the silver carriage the moon sister once used is in the hall of the stars. As we have seen many in the loading screen (night ver), the moon is above this place so this place cannot be the lunar palace but is part of the sky kingdom/1st civilization

I’ve always thought the loading screen and the general area where you first start is the Gateway between worlds

Maybe the heaven realm you were speaking of is actually a place where you can enter into any world. If you read Narnia there in the first book os described a forest with lots of pools in the middle. If you jump in these pools you can teleport into another world and every pool is for another world. Maybe the door we enter from is like a pool i that forest and teleports us in teyvat (even tho teyvat might not be correct since it is confirmed to be just a continent).