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  2. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    Treating a month as 30 days and a year as 360 days was devised for its ease of calculation by hand compared with manually calculating the actual days between two dates. Also, because 360 is highly factorable, payment frequencies of semi-annual and quarterly and monthly will be 180, 90, and 30 days of a 360-day year, meaning the payment amount ...

  3. Knuckle mnemonic - Wikipedia

    en.wikipedia.org/wiki/Knuckle_mnemonic

    One form of the mnemonic is done by counting on the knuckles of one's hand to remember the number of days in each month. [1] Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index finger knuckle ...

  4. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    The actual length of a synodic month varies from about 29 days 6 hours and 30 minutes (29.27 days) to about 29 days and 20 hours (29.83 days), a variation range of about 13 hours and 30 minutes. Accordingly, for convenience, the Hebrew calendar uses a long-term average month length, known as the molad interval , which equals the mean synodic ...

  5. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  6. Sahasra purna chandrodayam - Wikipedia

    en.wikipedia.org/wiki/Sahasra_purna_chandrodayam

    This is a Hindu custom in India. The time between similar lunar phases, the synodic month, is on average 29.53 days, and thus 1000 moons equals 29530 days = 80.849 years = approximately 80 years, 10 months on the Western calendar. In practice the celebration traditionally is held 3 full moons before a person's 81st Birthday.

  7. Lunar phase - Wikipedia

    en.wikipedia.org/wiki/Lunar_phase

    The approximate age of the Moon, and hence the approximate phase, can be calculated for any date by calculating the number of days since a known new moon (such as 1 January 1900 or 11 August 1999) and reducing this modulo 29.53059 days (the mean length of a synodic month).

  8. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday.

  9. Aztec calendar - Wikipedia

    en.wikipedia.org/wiki/Aztec_calendar

    The tōnalpōhualli ("day count") consists of a cycle of 260 days, each day signified by a combination of a number from 1 to 13, and one of the twenty day signs. With each new day, both the number and day sign would be incremented: 1. Crocodile is followed by 2. Wind, 3. House, 4. Lizard, and so forth up to 13. Reed.