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FutureStarrHow Many Days in a Monthor
A lot of people might answer 365, but that’s not always true. The answer depends on what month you’re talking about, what year you’re talking about, and if you’re talking about years, months, or days.
from Roman republican calendar month Aprilis. The Romans considered the month sacred to the goddess Venus, and its name may derive from that of her Greek equivalent, Aphrodite. Another etymology connects the name April with the Latin aperire, "to open," in reference to the unfolding of buds and blossoms at this season, spring in the Northern Hemisphere.
The Gregorian calendar is the most prevalently used calendar today. Within this calendar, a standard year consists of 365 days with a leap day being introduced to the month of February during a leap year. The months of April, June, September, and November have 30 days, while the rest have 31 days except for February, which has 28 days in a standard year, and 29 in a leap year. (Source: www.calculator.net)
The sidereal month is defined as the Moon's orbital period in a non-rotating frame of reference (which on average is equal to its rotation period in the same frame). It is about 27.32166 days (27 days, 7 hours, 43 minutes, 11.6 seconds). It is closely equal to the time it takes the Moon to pass twice a "fixed" star (different stars give different results because all have a very small proper motion and are not really fixed in position).
A synodic month is the most familiar lunar cycle, defined as the time interval between two consecutive occurrences of a particular phase (such as new moon or full moon) as seen by an observer on Earth. The mean length of the synodic month is 29.53059 days (29 days, 12 hours, 44 minutes, 2.8 seconds). Due to the eccentricity of the lunar orbit around Earth (and to a lesser degree, the Earth's elliptical orbit around the Sun), the length of a synodic month can vary by up to seven hours. (Source: en.wikipedia.org)