I was a USAF Navigator in the early 80s. I remember watching this on 16mm film. Everyone laughed at HoMoTo! This is the best video I have seen. I’m now learning to use a marine sextant. Concepts are the same but use the real horizon rather than a bubble.
Knowing the military they will have you watch it all in one sitting with only a few breaks and expect you to know it. Our method in the Marines was throw guys into a place with briar patches and cliffs at night time and give them a time limit to find boxes with numbers on them. If it dont make em good at navigation it will sure make em mean.
Finally, a Celestial Navigation video that coincides with the H.O. No. 9 American Practical Navigator publication and is clear and concise. Thanks for posting this great film from WWII.
Part One: Equatorial/Celestial System 00:00 Part Two: Horizon System 11:39 Part Three: The Intercept Method 18:43 Part Four: Solution and Practical Application 29:36
By far and away the clearest explanation of celestial nav I’ve had since I was at nautical college ,especially as it must be 50 odd years old Excellent
Great elementary introduction to celestial navigation. I have to admit that I am affected by Dyscalculia. Numbers seem to come and gone like grains of cool-aid powder. At 62 I have read many books on how to Celest nav and of late watched several you-tube vids for the last ten years and it is still like looking at a muddy lake and trying to pick out a single silt particle to me. I am fascinated by Celestial Navigation but its so far beyond me. I have developed other super powers, but number evade me. Jim Rodgers
Longitude easy at night For the Northern hemisphere, longitude for me is easy. If you can measure the Local Hour Angle of a star on the sky to an accuracy of 4 minutes or less you can get a longitude that is one degree or less from the observing position. A slight alteration of the calculation on page 279 of the Nautical Almanac and we have this. Longitude = GST - ( RA + LHA ) or LHA = GST - ( RA + Longitude) Where GST = Greenwich Siderial Time = GHA Aries. RA = the Right Ascension of the selected star. By using Polaris as the pivot point of a star clock and a plumb bob string for a meridian reference I've been getting longitudes to less than one degree easily from a list of 30 stars around Polaris. If measuring the LHA Westward, counter clockwise from the meridian upper branch, this is the angle to be added to the RA of the selected star. If measuring the LHA Eastward, clockwise, subtract LHA from RA. This gives Local Meridian Time, or Local Siderial Time. Then subtract LST from GST to get the GHA of the observing position. LHA can be measured in either time or degrees. This reduces to a minimum the time, math, materials, and paperwork needed to get something of a longitude, even if the observing position is not known. Just thought I would tell the world in case anyone is interested.
Thank you for posting this very illustrative old instructional video. Where did this video come from? Can you credit the source in the video description? I hope more old instructional videos like this are digitized.
I did the math for getting a position from 3 observations alone. At first I tried just finding the intersection of the planes that the circles of equal altitude live in, but that can give your position with an error of a whole degree across earth's surface or more (60nmi). To get accuracy, you can find where the circles of equal altitude all nearly intersect. My result involves too much computation to do without a computer program or spreadsheet though, and I wouldn't want to have to do it by hand even with the aid of a calculator.
23:29 when they show a triangle on the curved surface. How can you find the angle of the other sides when the angle will be different all the way between the three points?
Don’t bother answering this numpty. I knew I’d find one here. He’s either a lying grifter flat earth numpty, or he’s lazy and regurgitating some nonsense from one of his idiot hero’s videos, or he’s truly stupid and cannot conceive of 3D space, thinking that the lines are CURVING toward each other because they look like that on the two dimensional video screen. The fact that they are STRAIGHT LINES, traveling over a CURVED SURFACE is far, far beyond him. Just ignore the idiots.
¿Any idea how to locate the first aries point from any place you are on earth? Is for the purpose of practicing. Maybe some DIY clinometer gadget, that help me to locate where is the vernal point, and after that, finding a star by it´s declination and AR? Or maybe a simpler method? By the way, i like your tutorials, they are very good!
In nautical almanac GHA of Aries is given for every hour of the UT time. You take the GHA, add your longitude, and you get the LHA of aries (Local Hour Angle).
Polaris isnt exactly above the top of our planet and its movement is measured year by year. Every night it circles the north celestial pole like every other star in the northern hemisphere. there is even closer stars to the pole than Polaris just not as bright.
Thank you! By any chance could you steer me towards the source information for this video? I'm writing an essay and would like as accurate source info as possible.
It's most likely either a WW2 "USN" or "USAAF training film" like this: th-cam.com/video/gAqwEpPP0do/w-d-xo.html Or you could try the National Archives: www.archives.gov/education/history-day/video.html
Yes, same principle but different mathematics. With the use of a sextant, you are measuring the angle to calculate the distance you are from the GP of the heavenly body. GPS works on a signal sent from the satellite and your GPS is actually a receiver. Your GPS will receive the signal and decode it, and it works on the principle of the speed / distance / time equation. Your GPS knows the location of the satellite, the speed of the signal and the time in which it takes to get from the satellite to your GPS recieved. (there are some errors in which your GPS will apply (clock error, drift error) The GPS now now knows the exact distance you are from the satellite, and just like a single observation with a sextant - with one satellite you will have a circle on the earth. 3 satellites are required to give you a position fix. (however GPS uses 4 (see pseudo range)
@@marsa7600 No satellite Antennas exist not floating space satellites. Satellite antennas send and receive radio signals that is how gps and other things work out at sea.
@@DoctorShocktor doctor, be careful what u said. I am sailor so i need this actually. But i said like this because really i can't understand. Yeah, this was using then but year is 2024.
Nobody needs this. We have google maps and Smartphones. Why would I bother actually learning about my place in the universe when all I need to know is how to get to work, Wal Mart, and home!
This is ancient stuff. I have a GPS in my smartphone that pinpoints my location with greater precision and accuracy. Why go back to the stone ages, people? Hold on, my smartphone is on low battery so I need to find my charger cable.
The US and other Navy's would disagree, as in wartime GPS systems can be jammed, spoofed or put out of action entirely. th-cam.com/video/9IIMrk0QrIY/w-d-xo.html
Nobody needs this. We have google maps and Smartphones. Why would I bother actually learning about my place in the universe when all I need to know is how to get to work, Wal Mart, and home!
![[LIVE] : ONE ลุมพินี 88 | คู่เอก "ป้อมเพชร vs อัสลามจอน"](http://i.ytimg.com/vi/1ZqTVVbMgbo/mqdefault.jpg)
After years of following countless scatter-brained tutorials on TH-cam, it's so refreshing watching an old school professional one from long ago.
As former celestial navigator, I'm fond of seeing video like this. A very precious one.
Lucien Ratel lol , you my tribe
I was a RC-135 navigator back in the 80-90s. Lots of cell and grid too.
I was a USAF Navigator in the early 80s. I remember watching this on 16mm film. Everyone laughed at HoMoTo! This is the best video I have seen. I’m now learning to use a marine sextant. Concepts are the same but use the real horizon rather than a bubble.
Love these old instructional videos. Really clear and straight forward. Many thanks for uploading.
You're welcome Michael!
Knowing the military they will have you watch it all in one sitting with only a few breaks and expect you to know it.
Our method in the Marines was throw guys into a place with briar patches and cliffs at night time and give them a time limit to find boxes with numbers on them. If it dont make em good at navigation it will sure make em mean.
@@NathanielsCAD thanks for the old clips.
Finally, a Celestial Navigation video that coincides with the H.O. No. 9 American Practical Navigator publication and is clear and concise. Thanks for posting this great film from WWII.
Part One: Equatorial/Celestial System 00:00
Part Two: Horizon System 11:39
Part Three: The Intercept Method 18:43
Part Four: Solution and Practical Application 29:36
Best video on celestial navigation I've ever watched
One of the best celestial navigation video I have ever seen
By far and away the clearest explanation of celestial nav I’ve had since I was at nautical college ,especially as it must be 50 odd years old
Excellent
This is excellent. I love old-school instructional videos!
A brilliantly explained 👌..
A.B.C
A. accurate
B. brief
C.clear
Duh huh
This is the clearest explanation using animations. Cannot find similar computer generated new style animations that show the same material
Needed this video for an academic competition. Masterpiece
Superb! The best Celestial Navigation video in existence as we know it.
Total agreed.
Nice and simple demonstration
YES!
So informative post this instructional video like old days very clear .. I appreciate you
I m a seafarer nd this video is so knowledgeable for me..thnx for uploading
It's been 5 years now. Did you use it now on sea? I would like to hear from you. I'm a future seafarer too. I hope you'll receive my message.
Great elementary introduction to celestial navigation. I have to admit that I am affected by Dyscalculia. Numbers seem to come and gone like grains of cool-aid powder. At 62 I have read many books on how to Celest nav and of late watched several you-tube vids for the last ten years and it is still like looking at a muddy lake and trying to pick out a single silt particle to me. I am fascinated by Celestial Navigation but its so far beyond me. I have developed other super powers, but number evade me. Jim Rodgers
A brilliantly explained ..
A.B.C
A. accurate
B. brief
C.clear
This is great. I was initially wondering how the Polynesians do it and end up learning how to use my telescope better.
This old vid is great!!!!!
This is worth watching....
Wish they would of shown this to me in school when I was a kid.
Thanks 😎
Voice is very very nice, clear. video is knowlegeful
This is it...this teaches it all....great.
This is a great instructional video! It reminds me of the 16 mm. sound MOVIES we were shown alot of in my school days. From the 50's through the 70's!
Longitude easy at night
For the Northern hemisphere, longitude for me is easy. If you can measure the Local Hour Angle of a star on the sky to an accuracy of 4 minutes or less you can get a longitude that is one degree or less from the observing position. A slight alteration of the calculation on page 279 of the Nautical Almanac and we have this.
Longitude = GST - ( RA + LHA ) or
LHA = GST - ( RA + Longitude)
Where GST = Greenwich Siderial Time = GHA Aries.
RA = the Right Ascension of the selected star.
By using Polaris as the pivot point of a star clock and a plumb bob string for a meridian reference I've been getting longitudes to less than one degree easily from a list of 30 stars around Polaris. If measuring the LHA Westward, counter clockwise from the meridian upper branch, this is the angle to be added to the RA of the selected star. If measuring the LHA Eastward, clockwise, subtract LHA from RA. This gives Local Meridian Time, or Local Siderial Time. Then subtract LST from GST to get the GHA of the observing position. LHA can be measured in either time or degrees.
This reduces to a minimum the time, math, materials, and paperwork needed to get something of a longitude, even if the observing position is not known.
Just thought I would tell the world in case anyone is interested.
Hi, thank you for sharing a very nice educational video. I wonder if there are any more in the series and if you could share more this kind of videos.
Thank you for posting this very illustrative old instructional video. Where did this video come from? Can you credit the source in the video description? I hope more old instructional videos like this are digitized.
Perfect video about celestial navigation everseen👏👏
Thanks Brother! Would love To see more DIY videos!
Mary Blewitt author of one of the best practical books for small boat ocean navigation.
Thank you for sharing this quality content!
Thank you so much for this amazing Video :)
I did the math for getting a position from 3 observations alone. At first I tried just finding the intersection of the planes that the circles of equal altitude live in, but that can give your position with an error of a whole degree across earth's surface or more (60nmi). To get accuracy, you can find where the circles of equal altitude all nearly intersect. My result involves too much computation to do without a computer program or spreadsheet though, and I wouldn't want to have to do it by hand even with the aid of a calculator.
By manually computing means it takes time in real life application right
On a ship would you would plot the intercepts on a Universal Plotting Sheet.
Fantastic.....most appreciated
Thanks Ambrose!
thanks!!! helps a lot for science
Excellent video ☺️👍
simply brilliant
I was not thinking of a Japanese navigator this video is dated but i love it.
very clear ,Best Method to make Understand us
It’s old, it’s boring to some. To me, it’s great!
23:29 when they show a triangle on the curved surface. How can you find the angle of the other sides when the angle will be different all the way between the three points?
Kryss Tal website.. this will show you how to calculate.
Sight Reduction tables or by using a spherical trigonometry formula.
Google on "spherical trigonometry" for a full explanation. The formulae are more complicated than those for plane triangles but work in a similar way.
Don’t bother answering this numpty. I knew I’d find one here. He’s either a lying grifter flat earth numpty, or he’s lazy and regurgitating some nonsense from one of his idiot hero’s videos, or he’s truly stupid and cannot conceive of 3D space, thinking that the lines are CURVING toward each other because they look like that on the two dimensional video screen. The fact that they are STRAIGHT LINES, traveling over a CURVED SURFACE is far, far beyond him.
Just ignore the idiots.
Can i ise your videos to post it on my page as many students in india can get educated from this video? If you agree please let me know
¿Any idea how to locate the first aries point from any place you are on earth? Is for the purpose of practicing. Maybe some DIY clinometer gadget, that help me to locate where is the vernal point, and after that, finding a star by it´s declination and AR?
Or maybe a simpler method? By the way, i like your tutorials, they are very good!
You get the GHA of the first point of Aries from the Nautical Almanac. It's no longer in Aries, it is now in Pisces.
In nautical almanac GHA of Aries is given for every hour of the UT time. You take the GHA, add your longitude, and you get the LHA of aries (Local Hour Angle).
This is very interesting. I wonder do they teach this kind of stuff to Quartermasters who sit the Navy ships out at sea?
Yeah they still do I can assure you
yes, but to only higher level QM"s (E6 and above.)
zenith on the north pole is polaris; wat is zenith on the south pole?
Polaris isnt exactly above the top of our planet and its movement is measured year by year. Every night it circles the north celestial pole like every other star in the northern hemisphere. there is even closer stars to the pole than Polaris just not as bright.
Thank you! By any chance could you steer me towards the source information for this video? I'm writing an essay and would like as accurate source info as possible.
It's most likely either a WW2 "USN" or "USAAF training film" like this:
th-cam.com/video/gAqwEpPP0do/w-d-xo.html
Or
you could try the National Archives: www.archives.gov/education/history-day/video.html
NathanielsCAD thank you so much!
I guess it's the British version of "Bowditch" then?
Thank youuuuuuuu!
the Masterpiece!
Ahhhhhhh yes, lieutenant Homoto, he so happy
Oh man that is indeed an artifact (to put it gently!), subject matter though is very well presented.
I WONDER IF THIS WAS A WALT DISNEY CARTOON
old but good
Thanks for sharing. :)
I'm remembering sea level, then moving forward
Can anyone explain as to why is the sun going eastwards at 09:00 minutes ?
What was being depicted was merely the Sun's northward change in declination toward the first point of Aries.
Holy definitions bat man!
see you all when earth's polarity shifts and the axial orientation changes 😁
It all begins at the King James throne
It begins with those blessed with an understanding of geometry.
So basically how to do gps with out man made satellites or electronics :)
marshalcraft exactly! GPS uses the exact same principals, except with man made satellites acting in place of stars
Yes, same principle but different mathematics.
With the use of a sextant, you are measuring the angle to calculate the distance you are from the GP of the heavenly body.
GPS works on a signal sent from the satellite and your GPS is actually a receiver.
Your GPS will receive the signal and decode it, and it works on the principle of the speed / distance / time equation.
Your GPS knows the location of the satellite, the speed of the signal and the time in which it takes to get from the satellite to your GPS recieved.
(there are some errors in which your GPS will apply (clock error, drift error)
The GPS now now knows the exact distance you are from the satellite, and just like a single observation with a sextant - with one satellite you will have a circle on the earth. 3 satellites are required to give you a position fix. (however GPS uses 4 (see pseudo range)
@@ozzidan Satellites don't exist
@@ZackWolfMusic Yes, they do. Have you been in the middle of the ocean? No? GPS is working there.
@@marsa7600 No satellite Antennas exist not floating space satellites. Satellite antennas send and receive radio signals that is how gps and other things work out at sea.
This is the shit, Tyvm for uploading!
But flat earthers
This looks like something that be on Cartoon Network in 1994 lol 😂
Quite an abrupt ending.
wow nice
Why does a person want to learn this? i can't understand it. as well as if the person who think it is unnecessary.
You don't need to learn how to do celestial navigation.
@@marcg1686 actually i had to at my college
Because some people travel farther than your daily trip from your trailer to the mailbox to pick up your government check.
@@DoctorShocktor doctor, be careful what u said. I am sailor so i need this actually. But i said like this because really i can't understand. Yeah, this was using then but year is 2024.
16:49
43:07
The japanese🤣
Earth is flat!
Like your brain
That is the reason I was lost using celestial navigation 😂. 5 nautical miles from real position.
@@lucienratel5672 No..
No, it's not.
land surveying says otherwise. They’ve only been doing it for thousands of years.
Nobody needs this. We have google maps and Smartphones. Why would I bother actually learning about my place in the universe when all I need to know is how to get to work, Wal Mart, and home!
This is ancient stuff. I have a GPS in my smartphone that pinpoints my location with greater precision and accuracy. Why go back to the stone ages, people?
Hold on, my smartphone is on low battery so I need to find my charger cable.
The US and other Navy's would disagree, as in wartime GPS systems can be jammed, spoofed or put out of action entirely. th-cam.com/video/9IIMrk0QrIY/w-d-xo.html
Whoever designed GPS had to know this!
My boat has all the best electronics…oops, what happened to the power? Where am I?!?!?!?
YOU don’t need it, because WE don’t care if you get lost and die. So don’t worry about it champ.
Nobody needs this. We have google maps and Smartphones. Why would I bother actually learning about my place in the universe when all I need to know is how to get to work, Wal Mart, and home!
So you’re working through a series of banned accounts? Shocking.