How is parallax calculated?

1 Answer
F. Javier B.
Apr 13, 2018

See below

Explanation:

There is two parallax to be calculated: the daily and yearly parrallax

Daily parallax is used to measure distance to satelites and is calculated as follows p´´=a·sigma/(Dsin1´´) where a is mayor semi axis Earth-Sun, D the distance to satelite from Earth, sigma is a correcction due to no sphericity of Earth and p´´ is given in seconds of arc.

The yearly parallax is used to calculate distance to starts and in calculated by

p´´=(lambda+omega-lambda+omega)/2 where lambda, omega are respectively the longitude of Earth and star in ecuatorial coordinates in the rigth moment they differ in 90º or 270º

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