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20 No. 2. Parallax method
(Having determined D, we can employ a similar
method to determine the size or angular diameter
of the planet. If d is the diameter of the planet
and at the angular size of the planet (the angle
subtended by dat the earth), we have
ad/D
The angle at can be measured from the same
location on the earth. It is the angle between
the two directions when two diametrically
opposite points of the planet are viewed through
the telescope. Since D is known, the diameter
of the planet can be determined using Eq. (2.2).
Example 2.1 Calculate the angle of
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