lunar month definition

  • noun:
    • the typical time taken between successive new or complete moons, add up to 29 days, 12 hours, 44 minutes. Also called synodic month.
    • an interval from one brand new moon before next.
    • a synodic thirty days of approximately 29.53 times, calculated from a lunar phase through to the return of the exact same period.
    • a sidereal thirty days of approximately 27.32 days, how long taken because of the moon in its orbit towards Earth to go back into the same point as viewed against the background of stars.
    • the time scale of one transformation of this moon, specifically a synodical change; but a few kinds tend to be distinguished, while the synodical thirty days, or duration in one new moon to the next, in mean size 29 d. 12 h. 44 m. 2.87 s.; the nodical thirty days, or time of revolution from node into same again, in total 27 d. 5 h. 5 m. 36 s.; the sidereal, or time of change from a star towards the same again, equal to 27 d. 7 h. 43 m. 11.5 s.; the anomalistic, or period of transformation from perigee to perigee once more, in total 27 d. 13 h. 18 m. 37.4 s.; plus the tropical, or period of passing from any point associated with the ecliptic into the exact same again, add up to 27 d. 7 h. 43 m. 4.7 s.
    • the time scale between successive new moons (29.531 times)
  • adjective:
    • See Month.

Related Sources

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