An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1 Search : Synodic period
synodic period
  دوره‌ی ِ هماگمی   
dowre-ye hamâgami

Fr.: période synodique   

1) For planets, the mean interval of time between successive → conjunctions of two planets, as observed from the Earth. For → inferior planets (Venus and Mercury):
1/P = 1/E + 1/S.
For → superior planets (Mars, Jupiter, etc.):
1/P = 1/E - 1/S,
where P = → sidereal period of a planet, E = synodic period of the Earth, and S = synodic period of the planet. For example, the synodic period of Jupiter, calculated from the sidereal period of Jupiter (P), 11.856 years, via 1/11.856 = 1/1.0 - 1/S, is 398.9 days.
2) For satellites, the mean interval between successive conjunctions of a satellite with the Sun, as observed from the satellite's → primary.

synodic; → period.