Proof that Earth revolves around the Sun is obtained by the use ...

[colton]

Proof that Earth revolves around the Sun is obtained by the use of ______________ and the ______________.
 Fill in the blank(s) with correct word

Question 2

The angle of incidence of a light wave is
 a. different depending on whether there is diffuse or specular reflection.
  b. measured from a normal to the surface.
  c. equal to the angle of refraction.
  d. measured relative to the surface of the material.

[morrie123456]

Answer to Question 1

parallax; aberration of starlight

Answer to Question 2

b

[colton]

Excellent

[momolu]

Thanks for the timely response, appreciate it