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Why is solar gravity only a secondary source of tidal range when the sun is so much larger than the moon?
Wiki User
∙ 8y ago
Tidal forces depend on both the mass of the object and the distance from it. Tidal forces are directly proportional to mass and inversely proportional to the cube of the distance. This means that changes in distance have a greater effect than changes in mass. The sun is about 27 million times more massive than the moon is, but is also about 390 times farther away. If you do that math on this, it works out that the moon exerts roughly twice the tidal force on Earth that the sun does.
Wiki User
∙ 8y ago
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