Use the small angle approximation to calculate the angular size of Venus, in arcseconds at both its closest approach to Earth and its most distant.
Venus diameter = 1.2x104 km
Closest approach: Distance = 4.47x10 km
Furthest approach: Distance = 1.94x108 km
How did Galileo's observations of the changing angular size of Venus help prove the heliocentric
model of the Solar System?
Note 1 radian = 206265 arcseconds
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