The correction which must be applied to the altitude of a heavenly body in the solar system as observed, in order to give the altitude corrected to the Earth's centre. Its value is given by p-+Pcos cc, where /?=geocentric parallax, P=horizontal parallax, and a=observed altitude corrected for refraction,

Link to This Definition

Did you find this definition of GEOCENTRIC PARALLAX helpful? You can share it by copying the code below and adding it to your blog or web page.
Edited and fact checked by Pam: Google +