According to Copernicus, retrograde motion for Venus must occur ...

[sc00by25]

According to Copernicus, retrograde motion for Venus must occur around:
 
  A) inferior conjunction, when it passes between us and the Sun.
  B) quadrature, when the planet is 90 degrees away from the Sun.
  C) greatest elongation, when the planet is farthest from the Sun.
  D) superior conjunction, when the planet is on the far side of the Sun.
  E) opposition, when the planet lies opposite the Sun in the sky.

Question 2

Since when we see Saturn's rings edge-on, they seem to disappear; they must be ________.
 
  Fill in the blank(s) with correct word

[Meganchabluk]

Answer to Question 1

A

Answer to Question 2

very thin

[sc00by25]

Wow, this really help

[nanny]

Thanks for the timely response, appreciate it