Tanisha is wrong in her conclusion ( i.e. the moon will appear dark only when it is behind the earth ( furthest away from the sun ) )
The moon gets its light from the sun and the closer the moon is to the sun the more light it gets and is has to be positioned in-between the sun and the earth to have such light rays as well.
When the moon is furthest from the sun it will be positioned behind the sun ( i.e. the earth is in-between the sun and the moon ). during this period the moon will appear dark because the Earth been bigger than the moon sheds away light rays coming from the sun towards the moon.
Hence we can conclude that Tanisha is wrong in her conclusion.
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