Thanks for making basic cn easy to understand. One question, why is DR not used as AP. Looking forward your next video.

This was a now to watch and ‘m now ready to circumnavigate. ❤

"This side wants to be flat." Truth.

You are great and make is so easy to understand!!! Thank you!!!!!

Video has been sped up.

My boy John 1. Lol

It's cool to see how the light

how about a electronic voice recorder, start it at a "certain" time, and then when sighting say mark, then can go back through the audio and get time difference from when it started to when one "says mark" ...... just an idea :)

Amazing teacher ❤ thank you

Congratulations on presenting comprehensive introduction to the practice of celestial navigation so clearly. I would like to add a minor point, that doesn't affect the accuracy of your instructions. Please note that the spherical triangle which Tables 229 solve isn't the one you drew on the board. Two of its vertices are, as you point out correctly, are AP (the assumed position) and GP (the geographical position of the celestial body). But the third vertex is the elevated pole (N or S pole), and not the right angle formed by the AP meridian line and the GP latitude line. You may see these triangles on page ix of the Introduction included in all volumes of the 229 tables.

To get LONGITUDE directly from the stars at night three is a very simple method. Measure the Local Hour Angle of a star around Polaris. Add the LHA to Right Ascension of the star to get Local Meridian Time. Then subtract LMT from Greenwich Meridian Time obtained for the same moment, and you have a longitude. I have been doing this for a few years and it works

amazing stuff ! I rewatch it every 2 years :) after few times - I fell much more confident now .... and start using my sextant on Baltic Sea (just for training purposes). Cheers

So cute😀👍🛳️!!!

Fantastic teacher👍👍👍

Omg!!! This guy wears me out. Saying the same thing over and over. At 41 minutes i had to go

Thank You Cpt. Nesh!

Thank you very much

This is the best simplified version of teaching celestial navigation on KZbin. Best thing being that , he does not uses the jargon. Wonderful work sir.

nice, very nice!

This should be a flat earth debunking video. You did it without even knowing it

2hr 30+. ‘Made easy’?!!! 2 1/2 hours plus. Outta here.

Sounds like ocean waves crashing on the beach in the background.

I like to reserve "declination" for discussion about the variance between true and magnetic north. I understand your use. Thanks for the explanation

You blab your arse away without teaching anything. you talk way too much. you are knowledgable but dont know how to deliver information. the first 10 minutes of video is useless

This is an exceptionally well-done build log, my T37 is on its way, and this build log will help immensely. Thank You

THANK YOU SIR

This guy’s just great. Im a novice and this instructor is exactly what I need to understand the concepts of navigation.

The only easy parts to celestial navigation are latitude by Polaris and noon longitude (never done by me). The rest is easy to screw up (extraction, calculation, and plotting errors). Former RC-135 navigator. Thank for sharing.

Best Dang Course on Navigation on the internet, Thank You Sir!

this is the easy version? 2 and three quarter hours for one part? Second part better be 3 seconds long. What's the difficult version? Maritime academy 4 year program?

This Great Thank You

I always remind myself that celestial navigation tells you where you are on an ocean, it does not tell you what side of the table you are sitting on. I also remind myself: Latitude tells you how far north and south you are, Longitude tells you how far east and west you are, Altitude tells you how high you are and Attitude tells you if you're getting dinner tonight.

At 06:48:42 the LHA shouldn't be 342° instead of 018°?

😅

Hey, is this MIT OPEN COURSE WHER

00:00:00 Introduction 00:10:00 Watch Time 00:27:00 Sextant Height 01:16:00 Dec & GHA from Nautical Almanac 03:35:00 Hc & Z from Sight Reduction Table 05:57:00 Making a Plotting Sheet 06:20:00 Practice Problems Bought the cheapest sextant from flipcart @ $12 .... will get it by next week, and then try out from my terrace 😊

Subscribed and liked. You are doing the Lord’s work 👍

Celestial navigation works because the North Star, Polaris never moves from its point in the sky above the North Pole. If the earth were a spinning globe, orbiting the sun, and chasing the sun around the Milky Way, it seems clear that Polaris would not remain in the same spot in the sky forever. All the stars and constellations would be observed to change their positions along with the earth's movement. If the earth was orbiting the sun, every six months our view of the night time sky would be opposite of the prior starting point. Shouldn't we see a different set of stars and constellations every six months?

Should of been taught this from first grade, why we were not pissies me OFF

It would help alot if you just used a flat earth map

I was a deep sea navigator for eleven years tramping all around the world we only had a magnetic compass a sextant and a chronometer Starting in the 1950s The current growth round the world single handed race revived my interest in celestial navigation which I had completely forgotten. your explanation is superb and very clear I am thoroughly enjoying re learning even though at 86y I only sail in local Uk estuarys

CORRECTION: radius instead diameter 58:45 and 55:14

This is exactly how I write technical documentation for complex banking and pharma processes. General to specific. It's always frustrating to see a lecturer pile loads of data on the heads of new students without first explaining to them what, exactly, they are doing or trying to understand. Hats off to you. "How are you with differential calculus?" lmao. Good one.

…and of course, thanks…

Not the first time it’s been mentioned but I chuckle every time I open this. Navigation made easy in a 7 and a half hour video…😂😂

Fortunately no useless Astronomy knowledge is given in this lesson. Congratulations!

Thank you!

1:37:30 - first diagram (distance D from ground point gp: D = 90 - Hs). D is measured in degrees, but can be converted to nautical miles, nm, by multiplying by 60. 1:38:00 - second diagram (our position expressed as an intersection of two circles/two Lines Of Position, LOP's). 1:38:34 - third diagram, the "trick" (Sight Reduction Tables). Expressing our (angular) distance and direction from a gp as an (angular) distance from an assumed position (ap) on the navigational chart (with known latitude and longitude coordinates for both the gp and ap). Sight Reduction table lists values for Height computed (Hc) - the predicted height sextant (Hs) from any assumed position. (Hc = 90 - distance from ground point, gp) If, for example, the predicted Hc of the assumed position is 2 degrees greater than our local sextant reading (Hs), it means our Line Of Position is 2 degrees farther away from the Line of Position of the assumed position as well as from the gp of the celestial body.

@nathanoakley1980 sent me . he and his panel reviewed your content and celestial navigation needs a 90 degree angle to work .. that dont work with a curved baseline . needs a flat horizon for that .

I hope you still read this. I took your course awhile ago. I always had a question. Since today you have programs like AutoCad that could blow up a map in software. Using spherical trig to calculate an exact intersection point. I was blown off course going to Hawaii from NewPort Beach. No GPS in 1985. It worked using my computer software. We had a large sail boat. Anyway I love your lectures. Fraser