The angular diameter of the Sun on Earth is about 30 ‘, and its brightness is -26.8 ^ m. What are the angular diameter and brightness of the Sun when viewed from the surface of Mercury?
The average distance of Mercury from the Sun is 0.387 AU, 2.58 times less than the distance from the Sun to the Earth. When viewed from this planet, the angular diameter of the Sun will be 2.58 times greater than on Earth, that is, about 1.3 °. The magnitude of the Sun on Mercury will be
m = –26.8 – 5 lg 2.58 = –28.9
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