Two Self-Consistent FORTRAN Subroutines for the Computation of the Earth's Motion

Details Two Self-Consistent FORTRAN Subroutines for the Computation of the Earth's Motion Two Self-Consistent FORTRAN Subroutines for the Computation of the Earth's Motion

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...41....1s&link_type=abstract

Astronomy and Astrophysics Supplement, Vol. 41, P. 1, 1980

Astronomy and Astrophysics

Astrophysics

114

Scientific paper

The subroutine BARVEL generates heliocentric and barycentric velocity components of the Earth. As an option, the subroutine BARCOR may be called afterwards; it generates heliocentric and barycentric coordinates. Relative to the ephemeris DE 96 of the Jet Propulsion Laboratory, the maximum errors are: 42 cm/s for the velocity components; 1.1 × 10-5 Au for the heliocentric, and 4.6 × 10-5 Au for the barycentric coordinates. The subroutines can be used on any computer whose word length in single-precision, floating point arithmetic corresponds to ≥ 6 significant decimal places. This paper explains the features of the subroutines and the definition and origin of the numerical constants involved. Listings of the subroutines and of associated programs are included. A test program gives the possibility of checking the subroutines on the user's own computer.

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