Analytical Expressions of the Earth's Position and Velocity for the Calculation of Apparent Positions
Abstract
In order to calculate the apparent positions of stars, the barycentric and heliocentric positions of the earth and the barycentric velocity of the earth are required. It is shown that several tens of trigonometric terms for their expressions are sufficient for analyses of optical observations which have an observational accuracy of the order of 1 marcsec. Also given are analytical expressions for the position and velocity of the earth with higher precision, for use in analyses of precise astrometry such as VLBI observations.
 Publication:

Celestial Mechanics
 Pub Date:
 March 1987
 DOI:
 10.1007/BF01238774
 Bibcode:
 1988CeMec..41..389S
 Keywords:

 Earth Orientation;
 Orbital Velocity;
 Solar Orbits;
 Astrometry;
 Center Of Gravity;
 Equinoxes;
 Position (Location);
 Solar System;
 Tables (Data);
 Trigonometric Functions;
 Astrophysics