lunar month

In lunar calendars, a lunar month is the time between two successive similar syzygies (new moons or full moons). There are many variations. In Middle-Eastern and European traditions, the month starts when the young crescent moon becomes first visible at evening after conjunction with the Sun 1 or 2 days before that evening (e.g. in the Islamic calendar). In ancient Egypt the lunar month began on the day when the moon could no longer be seen just before sunrise. Others use a reckoned moon (e.g. the Hebrew calendar), or use a tabular scheme (Ecclesiastical lunar calendar). Yet others run from full moon to full moon. Calendars count integer days, so months may be 29 or 30 days in length, in some regular or irregular sequence. But all lunar months approximate the mean length of the synodic month of approximately 29.53059 days (29 days, 12 hours, 44 minutes and 3 seconds).
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Un mois lunaire est une unité de temps correspondant à la durée entre deux occurrences d'une position relative de la Lune et de la Terre.
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ماه قمرى ،ماه هلالى ،syn : lunation synodic priod,
علوم هوايى : ماه قمرى
علوم دريايى : synodical month
 کلمات مرتبط(2) 

کلمات مرتبط(lunar month):



بازگشت به واژه lunar month


lunar 
month 

朔望月

lunar month
n : the period between successive new moons (29.531 days) [syn: moon, lunation, synodic month]