Low-precision formulae for planetary positions

Abstract

Numerous modern applications have created a demand for low-precision (1 arc min) formulas for the positions of the sun, moon, and planets. With the power of a computerized formula manipulator which can handle algebraic and trigonometric expressions, the development of simple expressions for coordinates and elements from the existing analytic theories is now feasible. The paper presents the results of such developments in a form suitable for use with hand calculators, minicomputers, or microprocessors. The outputs are always in the form of series. The series are also available on punched cards or in the form of FORTRAN subroutines. The full-precision (1 arc sec or better) formulas with unlimited time validity are being developed. Several tables are included.