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www.reference.com/article/calendar-month-52b850fad1963633

According to Longman Dictionary of Contemporary English, a calendar month is a full month or a specific date in one month that corresponds to the same day in the next. Months were first used in Mesopotamia and revolved around the cycles of the moon.

www.reference.com/article/school-calendar-7df5f784edc9579a

A school calendar is very similar to any other calendar used to keep track of important dates and events. Schools often issue their students and parents school calendars that include the events or details of each school day in the year.

www.reference.com/science/4-1-4-academic-calendar-36d96857ed159e3a

A 4-1-4 or 4-4-1 academic calendar incorporates two terms that last approximately 14 weeks, with the addition of a smaller one month term that falls either in January or May. For example, some colleges follow a modified 4-1-4 academic calendar, with two 13-week semester...

www.reference.com/science/considered-calendar-day-a188967c6ec611b6

A calendar day is a period from midnight on a given day to midnight on the next day. Thus, a calendar day is a period of 24 hours starting from midnight.

www.reference.com/science/calendar-quarter-4135ba1310e8ebec

A calendar quarter is a period of three consecutive months, and there are four quarters per calendar year. The quarters of the calendar year are January, February, March (quarter 1); April, May, June (quarter 2); July, August, September (quarter 3); and October, Novembe...

www.reference.com/article/different-types-calendars-c97cd0c50a4fa7d4

The types of calendars used by societies have varied throughout history. According to the education website EDinformatics, lunar calendars are synchronized to the phases of the moon, whereas solar calendars are linked to the perceived movement of the sun causing the cha...

www.reference.com/science/invented-first-calendar-f4255d5095d8fd98

Evidence indicates that the first calendar was created by the Stone Age people in Britain about 10,000 years ago. The earliest known calendar was a lunar calendar, which tracked the cycles of the moon.