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4 Dec 2021

Given information

Given you are measuring star parallaxes from the Moon instead of Earth and asked what corrections you have to make and also to mention the changes that would occur if you were measuring parallaxes from Mars.

Step-by-step explanation

Step 1.

If the parallaxes were measured from the Moon, the method would have to be adjusted to account for the Moon's position with respect to the Earth-Sun reference line.

The measurements can be made in two ways:

1. If the measurements are taken two weeks apart; ie, at the full moon and new moon, one must make an assumption that the Earth is not that far from the sun and also the distance 'd' in the figure below must be Earth-moon distance.

2. If the measurement is made six months apart at full moon, the distance 'd' in the figure below will be given by;

d =Earth-Sun distance + Earth-moon.

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