Validity of the relations between the synodic and sidereal rotation velocities of the Sun

Abstract

Existing methods for conversion between synodic and sidereal rotation velocities of the Sun are tested for validity using state of the art ephemeris data. It is found that some of them are in good agreement with ephemeris calculations, while the other ones show a discrepancy of almost 0.01 deg per day. The discrepancy is attributed to a missing factor and a new corrected relation is given.

Accepted for publication in Sol. Phys., 7 pages, 3 figures

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