from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to a synod; synodal.
  • adj. Relating to the conjunction of celestial bodies, especially the interval between two successive conjunctions of a planet or the moon with the sun.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of, related to or produced by a synod; synodal
  • adj. Of or pertaining to the conjunction of two or more heavenly bodies

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to a synod; transacted in, or authorized by, a synod.
  • adj. Pertaining to conjunction, especially to the period between two successive conjunctions; extending from one conjunction, as of the moon or a planet with the sun, to the next

from The Century Dictionary and Cyclopedia

  • Same as synodical.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin synodicus, Ancient Greek συνοδικός (sunodikos, "of or related to an assembly or meeting"). Equivalent to synod +‎ -ic.


  • Venus thus overtakes and passes the earth once in five hundred and eighty-four days, or nearly two and a half of her own years, constituting what is called her synodic period of apparent revolution as seen from this globe.

    Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky

  • The moon appears to go from one full moon to the next over a period of 29.53 days, known as a "synodic month."

    Yahoo! News: Business - Opinion

  • The moon revolves around Earth once with respect to the sun in about 29 1/2 days, a period known as a synodic month.

    CreationWiki - Recent changes [en]

  • In 1985, Buzz Aldrin theorized a so-called Aldrin Cycler corresponding to a single synodic period.

    Buzz Aldrin's Advice to Norm Augustine - NASA Watch

  • While the complete workings of this ancient calendar may never be fully determined, it is clear that the textile contains three of the components suggested for the later Inka calendar: the solar, sidereal lunar, and synodic lunar cycles.

    Fabric of Time

  • That's partly what's making this bash possible; ships can get to Garcia more easily now than when the synodic periods are askew.

    A King of Infinite Space

  • However, there's distinct travel routes — synodic periods is the technical term — between one populated asteroid and its neighbors, and they in turn comprise traverses, the interplanetary shipping lanes used by spacecraft moving through the Belt toward the inner system.

    A King of Infinite Space

  • "Display coordinates for ... um, synodic traverses in this quadrant of the Belt."

    A King of Infinite Space

  • This is because the Earth-Mars relationship repeats with a synodic cycle of 15 years.

    The Case for Mars

  • This striking series of lunar phases, constituting the synodic month, offered man another basic cosmological idea.

    Dictionary of the History of Ideas


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