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6 votes
Accepted

Has earthshine in fact increased since lights (say 1900); that is to say can we measure or has there been a measurable increase? What are the numbers?

Let me see if I can at least partially answer some of your (many!) questions, How would, or how is commonly, earthshine best stated (absolute magnitude, overall watts from the lunar surface, or?). (...
Peter Erwin's user avatar
  • 17.1k
1 vote

What is the position directly below the moon on the earth called - is it the lunar nadir?

Both Oxford dictionary and the Merriem-Webster dictionary have sublunar point, just like @asdfex has suggested. https://www.oxfordreference.com/display/10.1093/oi/authority.20110803100539770 https://...
Pierre Paquette's user avatar
4 votes

What can be learned from viewing the sun on earth during a total eclipse that cannot be studied by spacecraft in orbit?

"is there any way to position a probe so that it constantly experiences totality? Such as in Lagrange point L2 of some planet?" Careful reading of your linked Wikipedia page shows that the ...
Fe2O3's user avatar
  • 141
14 votes

What can be learned from viewing the sun on earth during a total eclipse that cannot be studied by spacecraft in orbit?

It is true that many of the things that we used to use eclipses for can now be done from space, continuously. Eclipses are still important because they are usually much more easily accessible than ...
James K's user avatar
  • 123k
5 votes

What is the longest time the Moon can stay in the sky?

In the polar regions, the Moon can be above the horizon for over 14 days, 19 hours. That's ignoring refraction and parallax. At the north or south pole, the celestial equator is on the horizon, so a ...
PM 2Ring's user avatar
  • 14.8k
1 vote

Ancient adjudication of the new moon from witness testimony

The questions posed to the witnesses can be used for three purposes: To evaluate whether an individual witness' testimony is plausible or not. To decide between two or more witnesses, or groups of ...
wberry's user avatar
  • 349
4 votes

Moon observations at different places on the earth

From the poles of the Earth the moon, sun and stars complete their daily motion in a circle centred directly overhead. This means that that rising and setting is much much slower. For the stars, (...
James K's user avatar
  • 123k
1 vote

Are these craters on the moon during eclipse

OK So yeah from this pic, exact time and date, I'm certainly not seeing the craters that I was hoping to see as in my pic. Was cool to think so anyway. Thank everyone for the help!
SupaD75's user avatar
  • 41

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