- Types:
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24-hour interval, day, mean solar day, solar day, twenty-four hour period, twenty-four hours
time for Earth to make a complete rotation on its axis
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night
the dark part of the diurnal cycle considered a time unit
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mean solar time, mean time
(astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)
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TDT, TT, ephemeris time, terrestrial dynamical time, terrestrial time
(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
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month
a time unit of approximately 30 days
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day, sidereal day
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
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bell, ship's bell
(nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m.
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60 minutes, hour, hr
a period of time equal to 1/24th of a day
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30 minutes, half-hour
a half of an hour
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15 minutes, quarter-hour
a quarter of an hour
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min, minute
a unit of time equal to 60 seconds or 1/60th of an hour
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quarter
a unit of time equal to 15 minutes or a quarter of an hour
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s, sec, second
1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
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attosecond
one quintillionth (10^-18) of a second; one thousandth of a femtosecond
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femtosecond
one quadrillionth (10^-15) of a second; one thousandth of a picosecond
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picosecond
one trillionth (10^-12) of a second; one thousandth of a nanosecond
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nanosecond
one billionth (10^-9) of a second; one thousandth of a microsecond
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microsecond
one millionth (10^-6) of a second; one thousandth of a millisecond
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millisecond, msec
one thousandth (10^-3) of a second
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tomorrow
the day after today
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today
the day that includes the present moment (as opposed to yesterday or tomorrow)
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yesterday
the day immediately before today
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morrow
the next day
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eve
the day before
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date, day of the month
the specified day of the month
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date
a particular day specified as the time something happens
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lunar month, lunation, moon, synodic month
the period between successive new moons (29.531 days)
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anomalistic month
period between successive perigees; approximately 27.5546 days
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sidereal hour
1/24 of a sidereal day
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sidereal month
period between successive conjunctions with a star, 27.322 days
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solar month
one-twelfth of a solar or tropical year
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man hour, person hour
a time unit used in industry for measuring work
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leap second
a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth's rotation
