You searched for: “month
Word Entries containing the term: “month
calendar month, lunar month
The period between one new Moon and the next which naturally averages 29.5 days, but the Western calendar uses, for convenience, a calendar month with a complete number of days, 30 or 31 (February has 28).

For adjustments, since there are slightly fewer than six extra hours a year left over, they are added to February as a 29th day every fourth year (leap year), century years being excepted unless they are divisible by 400; for example, 1896 was a leap year; 1900 was not.

This entry is located in the following unit: Measurements and Mathematics Terms (page 4)
design month
The month having the combination of insolation and load that requires the maximum energy from the photovoltaic array.
This entry is located in the following unit: Photovoltaic Conversion Efficiency Terms + (page 6)