a Grand Planetarium on my Ceiling

Рет қаралды 24,569

11 ай бұрын

This planetarium gets planet positions from NASA daily at midnight and aligns them without complex gears. A motor rotates Mercury, triggering a chain reaction among the other planets. This slow process is shown as a 30x timelapse in the video, taking 1.5 hours in real-time. The Sun houses the motor and other components, and the planetarium's diameter is 2.1 meters. There are also extra gears for the Moon's rotation.
You can make your own mini planet spinner at www.instructables.com/Grand-P...
music: "exit the Premises" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons.org/licenses/b...

Пікірлер: 17

@zwmm 10 ай бұрын

Nice project. A good tribute to pre-digital days

@greggv8 10 ай бұрын

That's a nice project. Could add orbit eccentricity with telescoping rods and cams in the hub. :)

@illusionmanager 10 ай бұрын

Clever idea, but only useful if the relative distance to the sun would be correct as well. Currently it only shows the direction, which is still accurate, even when not taking into account the eccentricity.

@tzkelley 10 ай бұрын

I love this project! But at the risk of making a comment about something I know nothing about, isn't the math to figure out the planet positions relatively straightforward? I can't imagine the angular velocity has changed appreciably over the course of 20,000 years. Seems like the connection to NASA is a source of frustration over time so maybe get rid of that dependency? Thanks for sharing this! I'll definitely be making one of these! One other question though--could you explain the function of earth's moon more?

@illusionmanager 10 ай бұрын

relatively straightforward indeed...for range of years. The moon is a bit more complicated. Getting data directly from NASA sounds cool anyway.

@AuxiliaryPanther 10 ай бұрын

Brilliant! Welcome from hackaday.

@sdspivey 10 ай бұрын

Why not have Neptune fixed in place. It moves less than 0.006 degrees per Earth day, or about 2 degrees per earth year, so isn't ever going to be noticed. Less wear on the whole system and half the time as a bonus. Just rotate the entire solar system to match the Neptune location. As it stands, you should paint a calendar on the ceiling, or at least mark out the seasons.

@illusionmanager 10 ай бұрын

because the esp32 microcontroller in the sun also acts as a webserver, which allows me to set it to any date between 9999 BC and 9999AD. Neptune moves a lot in that time. The Zero position (equinox) is currently parallel to one of the walls in my house. But yeah, it is missing a zodiac, I just don't know yet how to keep that beautiful and minimalistic. Who knows.

@sdspivey 10 ай бұрын

@@illusionmanager I thought it only showed the current state, not that you could change it.