Intercept calculation and direction of position line

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Intercept calculation and direction of position line - Sun as a celestial body

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Күн бұрын

Using an example, this video explains the calculations involved in deciphering the intercept and the orientation of the position line in the topic of celestial navigation.
Contents of this video will benefit mariners preparing for exams (written and oral examinations).
Mariners will also benefit by watching the following videos:
Intercept (Sun): • Calculating the interc...
Intercept (Sun -Example 2): • Intercept Calculation ...
Intercept (Star- example 1): • How to use the Interce...
Intercept (Star -example 2): • Calculation of interce...
Intercept (Planets): • How to use the Interce...
Intercept (Moon): • Calculating the interc...
Staggered observations (Example 1): • Staggered Observations...
Staggered observations (Example 2): • Staggered Observations...
Staggered Observations (Example 3): • Staggered observations...
Variation, deviation, and compass error: • What is the Variation,...
Longitude, GHA and LHA: • Relationship between l...
Ambiguity of chronometer time: • The ambiguity of chron...
Twilight: • Twilight: Nautical nav...
Calculating sunset time: • Calculating sunset tim...
Back angle of sextant: • Back Angles of a Sexta...
Using back angle (Meridian Passage): • Using the back angle o...
Long by chron (Sun): • Longitude by chronomet...
Long by chron (Sun -Part 1): • Long by Chron - Part 1...
Long by chron (Sun -Part 2): • Long by Chron - Part 2...
Long by chron (Star): • Longitude by chronomet...
Long by chron (Planets): • How to use Longitude b...
Long by chron (Moon): • Longitude by chronomet...
Ex-meridian (Sun): • How to use the Ex-meri...
Ex-meridian (Stars): • How to use the Ex meri...
Ex-meridian (Planets): • How to use the Ex-meri...
Ex-meridian (Moon): • Ex-meridian method for...
Polaris: • Polaris (Pole Star) - ...
PZX triangle: • PZX triangle Rational ...
Venus as morning or evening star: • Why Venus is known as ...
Solving quadrantal triangles: • Solving Quadrantal tri...
Circumpolar bodies (Theory): • Circumpolar Bodies Cel...
Circumpolar bodies (worked example): • Circumpolar Bodies - W...
Circumpolar bodies (more worked examples): • Circumpolar Bodies - M...
Circumpolar bodies (Crossing the prime vertical): • Circumpolar Bodies - C...

Пікірлер: 28

@waelsailor5414 Жыл бұрын

I won't forget to thank you for the thousand time for these bountiful and very helpful videos 💙

@thinkocean4448 Ай бұрын

More than perfect

@naimurrahman4025 3 жыл бұрын

Thank you sir,very much helpful video

@roneliotisoy8405 Жыл бұрын

thank you sir very informative

@gps9308 4 жыл бұрын

Thanks again for making these!

@SteeringMariners 4 жыл бұрын

You are most welcome buddy:)

@samw2670 3 жыл бұрын

How do you create a fix from this?

@divinesailor2662 2 жыл бұрын

Many thanks........

@user-qy5il8yz6o Жыл бұрын

Thanks sir.

@waelsailor5414 Жыл бұрын

Dear Sir Is it possible that you can solve an example of intercept method when 090°

@waelsailor5414 Жыл бұрын

Can A & B have a negative sign , or do we neglect the occasionally negative sign of the (Tan LHA) or (Sin LHA) when calculating A & B ?!!

@ahmadaliyu 2 жыл бұрын

Sir pls for this particular question can you show the actual plot on radar plotting sheet.. Thanks a lot

@fukryymundaa7779 3 жыл бұрын

Sir if we calculate LHA by this method then why we use long by crone formula in other questions. Please reply sir.....

@backpackercouples3883 3 жыл бұрын

How to do the calculation when longitude is not given but its mentioned body on east of meridian

@sohaibshaikh5481 4 жыл бұрын

What is east of meridian in questions

@lifeatsea31 3 жыл бұрын

Please can you send me the link ,solution of simultaneous observation and staggered observations

@rohitsingh5363 2 жыл бұрын

Hello sir ,I want to clear one think if longitude is East ,so do we suppose to subtract our Zone Time from the given ships time to Get the approx UT time/date. Because here you have added East , Can you please clear that .

@salvadorglasse-davies1458 2 жыл бұрын

You’re right. We subtract East and Add West.

@naldo8762 3 жыл бұрын

Thank you but question, how do I find the ITP POSITION? Should I use plane sailing method?

@TheJDenz 4 жыл бұрын

If true altitude is greater than calculated altitude the intercept is towards. Isn’t it? (True greaterrrrr towards )

@SteeringMariners 4 жыл бұрын

No, true-tiny-towards is correct:)

@karhukivi 4 жыл бұрын

Imagine looking up at a lighthouse light which is calculated at 45 degrees for your assumed position. If the angle you measure is only 30 deg, then are you nearer to the lighthouse or farther away? Clearly you are farther away from the lighthouse than your assumed position. So it follows that if the true altitude is greater than than calculated one, you must be closer to the lighthouse.

@karhukivi 4 жыл бұрын

@@SteeringMariners "Tabulated (i.e. Hc)-Tinier-Towards" is the mnemonic I see most often in publications, which is a good reason not to rely on mnemonics as they are ambiguous! I see you are using zenith distance (CZD) and if you subtract this from 90 you get Hc=28d 3.5'. Your Ho=27d 43.0' so Hc>Ho, which is "away" as you correctly say in your video.

@RiiZ89 2 жыл бұрын

I know this is a very old comment, but this briefly confused me, and I wanted to clear it up for anyone else currently studying. Actually..TheJDenz is correct. They both are correct. They're just tackling the intercept calculation differently. If you calculate the intercept using CZD by using the end formula CZD=Cos-1(0.47036) and then subtracting True Alt from 90... then yes --- True-Tiny-Towards. If you calculate the intercept using Hc (calcuated alt) using the end formula Hc=Sin-1(0.47036) then also yes... = True Alt > Hc = Towards // True Alt < Hc = Away The intercept is 20.5' away either way....As George said below, this can make using a mnemonic very confusing depending on the method you use.