Zagreb Astronomical Observatory

Zagreb, Croatia

Zagreb Astronomical Observatory

Zagreb, Croatia
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Skokic I.,Cybrotech Ltd | Brajsa R.,University of Zagreb | Rosa D.,Zagreb Astronomical Observatory | Hrzina D.,Zagreb Astronomical Observatory | Wohl H.,Kiepenheuer Institute for Solar Physics
Solar Physics | Year: 2014

Existing methods for conversion between synodic and sidereal rotation velocities of the Sun are tested for validity using state-of-the-art ephemeris data. We found that some of them agree well with ephemeris calculations while others show a discrepancy of almost 0.01{ring operator} day-1. This discrepancy is attributed to a missing factor and a new corrected relation is given. © 2013 Springer Science+Business Media Dordrecht.

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