I, like millions of others, have straddled the marker of the prime meridian at Greenwich. I know that it sounds foolish but to have your feet in two different hemispheres is somehow amusing. I doubt that flerfs can understand this level of humour.
Just consider any of the great circles passing between your feet, and you can have that same fun absolutely anywhere! That particular meridian is quite arbitrary (though convenient that we agree upon, and have an observatory at).
Part of the problem I had was, even with the video steamed to my TV, none of those numbers were really big enough for me to follow along, so thank you very much, Dr. Bob, for doing this followup!
Nah. Several centuries of successful navigation is all wrong. Only unemployed supermarket delivery boys are privy to how celestial navigation REALLY works. But he won't show you... It's a secret.
To make things more confusing, the celestial "prime meridian" (that is, Right Ascension of 0h) is actually in Pisces, not Aries. This is due to the procession of the equinoxes. This results in a change of a little less than 1 arc minute a year.
@@edby263 - it is the amount of time since the object "culminated" (i.e. crossed your local meridian), or the amount of time until culmination if the value is negative.
@@hadz8671 I don't believe that this is what Bob is talking about as he said that the sidereal hour angle never changes. For what Bob is talking about is you convert the RA to degrees, then subtract it from 360 (since RA runs in the opposite direction). So for Vega which has a RA of 18h37m41s, that is 360 - 279.42 degrees = 80.58 degrees or 80 degrees 35 minutes.
You obviously have never navigated anything anywhere. I would love to see your video about how sextant navigation works on a flat earth. Have you got one up?
I, like millions of others, have straddled the marker of the prime meridian at Greenwich. I know that it sounds foolish but to have your feet in two different hemispheres is somehow amusing. I doubt that flerfs can understand this level of humour.
What if the French had got there first, as they nearly did?
The world had a vote, which France abstained from, and French maps continued to use the Paris meridian for several decades.
Just consider any of the great circles passing between your feet, and you can have that same fun absolutely anywhere! That particular meridian is quite arbitrary (though convenient that we agree upon, and have an observatory at).
@@0LoneTech So long as it doesn't pass through France.
@@edby263 Greenwich passes through France as well.
Part of the problem I had was, even with the video steamed to my TV, none of those numbers were really big enough for me to follow along, so thank you very much, Dr. Bob, for doing this followup!
Nah. Several centuries of successful navigation is all wrong. Only unemployed supermarket delivery boys are privy to how celestial navigation REALLY works.
But he won't show you... It's a secret.
Its no secret : it just requires a four-sided triangle, no angle of which may be blue, and some skoi moiles.
@@alancrabb mean
Why pick on unemployed supermarket delivery people?
thank you sir ,
I avoid using west longitudes.
265° E long is just fine. No need for 95° W. IMO. W longitude is generally treated as (-) longitude.
To make things more confusing, the celestial "prime meridian" (that is, Right Ascension of 0h) is actually in Pisces, not Aries. This is due to the procession of the equinoxes. This results in a change of a little less than 1 arc minute a year.
this video is wonderful 🏅
how is the siderial hour angle related to right ascension?
The Hour Angle of a celestial object is the Local Sidereal Time minus the object's Right Ascension: HA = LST - RA
@@hadz8671 I knew that but was waiting for you to go first
@@edby263 - it is the amount of time since the object "culminated" (i.e. crossed your local meridian), or the amount of time until culmination if the value is negative.
@@hadz8671 I don't believe that this is what Bob is talking about as he said that the sidereal hour angle never changes. For what Bob is talking about is you convert the RA to degrees, then subtract it from 360 (since RA runs in the opposite direction). So for Vega which has a RA of 18h37m41s, that is 360 - 279.42 degrees = 80.58 degrees or 80 degrees 35 minutes.
@@stephenandrusyszyn3444 - OK, I will watch the video again to see what Bob is saying.
Greetings if the hour angle of the celestial body is 190 degrees in which hemisphere is the body located
If the Greenwich Hour Angle (GHA) is 190° then the celestial body is in the Eastern Hemisphere. It would be located at 170° East longitude.
That was too much for 00:46 hours…
Do you need angles that require a flat base line in the first instance. Welcome to flat earth
nope
@@ResearchFlatMoon think you do pal
actually have a look at my photo with the drawing compass and the globe, that might clear it up for you. Right in the community section.
You obviously have never navigated anything anywhere.
I would love to see your video about how sextant navigation works on a flat earth.
Have you got one up?