World Geography
The Penumbra is

formed by the tangent that intersects between the sun and the moon
both (a) and (b)
None of these
the outer portion of the moon's shadow

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World Geography
The sidereal month may be defined as

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

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