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.

sidereal month

n
(Astronomy) See month5

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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
References in periodicals archive ?
The Moon makes a full circle relative to the background stars every 27.32 days (sidereal month), moving its own apparent diameter (half a degree) in slightly over an hour.
As Table 2 shows, dividing the sum of the values of pendant strings 8A and 9A (200 + 202 = 402) by 27.25 (a time that corresponds to the length of the sidereal month, which is just over 2 days shorter than the lunar month of 29.5 days).