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12 relations: December 31, Dynamical time scale, Ephemeris, Ephemeris time, Epoch (reference date), February 30, Second, System time, Year 2000 problem, Year zero, 0J, 0th.
December 31
It is known by a collection of names including: Saint Sylvester's Day, New Year's Eve or Old Years Day/Night, as the following day is New Year's Day.
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Dynamical time scale
In time standards, dynamical time is the time-like argument of a dynamical theory; and a dynamical time scale in this sense is the realization of a time-like argument based on a dynamical theory: that is, the time and time scale are defined implicitly, inferred from the observed position of an astronomical object via a theory of its motion.
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Ephemeris
In astronomy and celestial navigation, an ephemeris (plural: ephemerides) gives the positions of naturally occurring astronomical objects as well as artificial satellites in the sky at a given time or times.
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Ephemeris time
The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris.
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Epoch (reference date)
In the fields of chronology and periodization, an epoch is an instant in time chosen as the origin of a particular era.
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February 30
February 30 (or 30 February) occurs on some calendars but not the Gregorian calendar, where the month of February contains only 28 days, or 29 days in a leap year.
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Second
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
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System time
In computer science and computer programming, system time represents a computer system's notion of the passing of time.
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Year 2000 problem
The Year 2000 problem, also known as the Y2K problem, the Millennium bug, the Y2K bug, or Y2K, is a class of computer bugs related to the formatting and storage of calendar data for dates beginning in the year 2000.
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Year zero
Year zero does not exist in the Anno Domini system usually used to number years in the Gregorian calendar and in its predecessor, the Julian calendar.
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0J
0J (zero J) or 0-J may refer to.
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0th
0th or zeroth is an ordinal for the number zero sometimes used under zero-based numbering, and may refer to.
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