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Old 2021-11-01, 18:24   #34
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Originally Posted by xilman View Post
Presumably, if you could arrange no leakage around the eyes.
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Determining the North South Axis
Disregarding the 5.1% inclination of the moon orbit plane to the ecliptic plane wouldn't following the Sun path give you the easterly direction and thus West, North and South?
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Old 2021-11-01, 20:04   #35
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The only issue with this human approach is that on the Moon the Sun shines for two weeks during the lunar day so one has to wait quite some time to observe the shortest tip of the shadow.
So? It takes decades if not years of observations to get a good orbit for Mars.

Patience young grasshopper.
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Old 2021-11-01, 20:07   #36
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Anyway, the travel restriction could make them think that they are living on some kind of a curved surface, not necessarily a sphere.
But it certainly shows them that they live on a surface of positive curvature when taken into consideration the almost constant rotation of the celestial sphere. The "almost constant" bit has already been suggested as a clue to the gravitational influence of the Earth and I have indicated how they could come up with Newtonian gravity.

The examples of the Sun, Jupiter and Venus would strongly suggest that they live on something close to a sphere.
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Old 2021-11-01, 20:08   #37
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Determining the North South Axis
Disregarding the 5.1% inclination of the moon orbit plane to the ecliptic plane wouldn't following the Sun path give you the easterly direction and thus West, North and South?
Yes. It is essentially the same as my vertical pole measurement but the latter is independent of the 5.1 degree inclination and varies primarily from the eccentricity of the Moon's orbit around the Sun which is much smaller. Once you have Newtonian gravity that effect could be calculated quite precisely..

Last fiddled with by xilman on 2021-11-01 at 20:10
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Old 2021-11-01, 21:26   #38
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Please see my ETA for post number 23.
I finally have to ask. What does ETA in your case mean? I only know it as estimated time of a(rrival etc.). You usually use it instead of PS, meaning some sort of addition. But I could not find some word combination that would be matching your usage.
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Old 2021-11-01, 22:02   #39
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I finally have to ask. What does ETA in your case mean? I only know it as estimated time of a(rrival etc.). You usually use it instead of PS, meaning some sort of addition. But I could not find some word combination that would be matching your usage.
I think he means Edited To Add, but he'll correct me if I'm mistaken.
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Old 2021-11-01, 22:07   #40
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Edited to Add
Please see "Slang, Chat & Pop culture (12)" tab below:

https://www.acronymfinder.com/Slang/ETA.html

It was a common acronym on the last forum where I used to hang out at.
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Old 2021-11-01, 22:38   #41
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Ah, , it is alway better to ask; thank you both!
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Old 2021-11-01, 22:56   #42
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Just like the Real Estate Mantra is: Location, location, location.

Here in Forums (or Fora) it is: Context, context, context.
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Old 2021-11-02, 02:39   #43
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Carl Sagan - Cosmos - Eratosthenes

https://youtu.be/G8cbIWMv0rI
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