Calendar is organized matrix showing the beginning, length & order of particular year, months, weeks and day. Calendar is derived as term for the first day of the month in the Roman calendar refer as calling of the new moon when it was first seen. It is also logical mean that lunar calendar is the base of all others calendars.
A system to organized the social life daily events i.e social, religious, commercial, administrative or useful purposes.

There are following calendar

  1. The Gregorian and Julian Calendars (Solar Calendar)
  2. The Islamic Or Hijri Calendar (Lunar Calendar)
  3. lunisolar calendar (Solar & Lunar Calendar)

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