World Geography
Who among the following proposed the Tidal Hypothesis of the origin of Earth and Solar system?

Hoyle-Lyttleton
Jeans-Jeffreys
Kant-Laplace
Chamberlin-Moulten

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World Geography
The sidereal month may be defined as

None of these
the period of rotation of moon
the period in which the moon completes an orbit around the earth
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky

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