sidereal month
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Related to sidereal month: synodic month, lunar eclipse
sidereal month
n.
The average period of revolution of the moon around the earth in reference to a fixed star, equal to 27 days, 7 hours, 43 minutes in units of mean solar time.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
sidereal month
n
(Astronomy) See month5
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
month
(mʌnθ)n.
1. any of the 12 parts, as January or May, into which the calendar year is divided.
2. the time from any day of one calendar month to the corresponding day of the next.
3. a period of four weeks or 30 days.
4.
a. Also called solar month. one-twelfth of a solar year.
b. Also called lunar month. the period of a complete revolution of the moon around the earth, as between successive new moons (synodic month), or between successive conjunctions with a star (sidereal month).
5. months, an indefinitely long period of time: I haven't seen him for months.
Idioms: a month of Sundays, an indeterminately great length of time.
[before 900; Middle English; Old English mōnath; c. Old Frisian mōnath, Old High German mānōd, (German Monat), Old Norse mānathr, Gothic mēnōths. See moon]
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| Noun | 1. | sidereal month - period between successive conjunctions with a star, 27.322 days month - a time unit of approximately 30 days; "he was given a month to pay the bill" sidereal time - measured by the diurnal motion of stars |
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