Abstract
The apparent coordinates in the printed material almanacs have inconsistencies concerning the reference frame. These inconsistencies produce secular errors of about 0 ″. 001/century in the equatorial coordinates and periodic errors of about 0 ″. 04 in the ecliptic coordinates. It is recommended that the calculation of apparent places of planets should be based on a consistent reference frame as well as on a consistent system of astronomical constants.
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Sôma, M. Toward consistency in the uses of ephemerides. Astrophys Space Sci 177, 451–456 (1991). https://doi.org/10.1007/BF00643718
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DOI: https://doi.org/10.1007/BF00643718