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Author Question: Aristotle's hypothesis was that A) lunar eclipses were created by our shadow. B) only a ... (Read 82 times)

urbanoutfitters

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on: Jul 27, 2018
Aristotle's hypothesis was that
 
  A) lunar eclipses were created by our shadow.
  B) only a spherical Earth would always cast a circular shadow on the Moon.
  C) lunar eclipses would have to happen every full Moon.
  D) the Sun lay at the center of the planet orbits.
  E) the Moon orbited the Earth.

Question 2

What is proper motion? How is it related to transverse velocity?
 
  What will be an ideal response?


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janeli

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

Annual apparent motion of a star across the sky, in arc seconds per year. If we also know the star's distance, this angular motion can be turned into the transverse velocity in km/sec.


urbanoutfitters

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Reply 2 on: Jul 27, 2018
Gracias!

atrochim

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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