Was 1993 A Leap Year

A leap year is a year in which an extra day is added to the agenda in order to synchronize information technology with the seasons. Since the tropical year is 365.242190 days long, a spring yr must exist added roughly one time every 4 years (four times the partial day gives ). In a leap year, the extra day (known as a leap twenty-four hours) is added at the cease of February, giving information technology 29 instead of the usual 28 days.

In the Gregorian calendar currently in use worldwide (except perhaps the Russian and Iranian calendars), in that location is a leap year every year divisible by four except for years which are both divisible by 100 and not divisible past 400. Therefore, the twelvemonth 2000 will be a leap yr, only the years 1700, 1800, and 1900 were not. The complete listing of leap years in the beginning half of the 21st century is therefore 2000, 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, 2040, 2044, and 2048.

The extra rule involving centuries is an additional correction to make up for the fact that 1 actress day every iv years is slightly too much correction (). This scheme results in the vernal equinox gradually shifting its appointment between March 19 and 21, beingness shifted once every leap yr, so being abruptly shifted in not-jump centuries (meet figure in a higher place).

In the Gregorian calendar, 97 years out of every 400 are leap years, giving the total number of days in 400 years as

The jump year was introduced in the Julian calendar in 46 BC. Notwithstanding, around 10 BC, it was found that the priests in accuse of computing the calendar had been adding leap years every three years instead of the four decreed by Caesar (Vardi 1991, p. 239). As a result of this error, no more leap years were added until viii Advertizing. Spring years were therefore 45 BC, 42 BC, 39 BC, 36 BC, 33 BC, 30 BC, 27 BC, 24 BC, 21 BC, 18 BC, 15 BC, 12 BC, 9 BC, eight AD, 12 AD, and every quaternary yr thereafter (Tøndering), until the Gregorian calendar was introduced (resulting in skipping 3 out of every four centuries). The UNIX control cal incorrectly lists 4 Advertizement as a spring year (Vardi 1991).

Century, Gregorian Calendar, Julian Calendar, Leap Mean solar day, Jump Second, Millennium, Year

Hollon, B. "An Introduction to Calendars." http://www.12x30.cyberspace/intro.html.

Seidelmann, P. K. Explanatory Supplement to the Astronomical Almanac. Factory Valley, CA: Academy Science Books, 1992.

Starr, A. "Leap Twenty-four hours/Bound Year." http://www.emailman.com/leapday/.

Strohsacker, J. "@ February 29 Leap Day." http://world wide web.mystro.com/leap.htm.

Tøndering, C. "Frequently Asked Questions about Calendars." http://www.tondering.dk/claus/calendar.html.

Vardi, I. "The Julian Agenda." §3.v.1 in Computational Recreations in Mathematica. Redwood City, CA: Addison-Wesley, p. 44, 1991.

© 1996-2007 Eric W. Weisstein

Was 1993 A Leap Year,

Source: https://scienceworld.wolfram.com/astronomy/LeapYear.html

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