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1) time, sequential arrangement of all events. The Columbia Encyclopedia, Sixth Edition. 2001
...The concept of time may be discussed on several different levels: physical, psychological, philosophical and scientific, and biological. 1 Physical Time and Its MeasurementThe...

2) solar time. The Columbia Encyclopedia, Sixth Edition. 2001
...The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial. When the center of the sun is...

3) universal time. The Columbia Encyclopedia, Sixth Edition. 2001
...Royal Observatory in Greenwich, England, setting the standard of Greenwich mean time (GMT). In keeping with tradition, the start of a solar day occurred at noon....

4) space-time. The Columbia Encyclopedia, Sixth Edition. 2001
...Space and time are joined together in an intimate combination in which time becomes the "fourth dimension." The mathematical formulation of the theory by H. Lorentz...

5) civil time. The Columbia Encyclopedia, Sixth Edition. 2001
...Civil time may be formally defined as mean solar time plus 12 hr; the civil day begins at midnight, while the mean solar day begins at noon. Civil time is occasionally...

6) standard time. The Columbia Encyclopedia, Sixth Edition. 2001
...Within a zone all civil clocks are set to the same local solar time. Adjacent zones typically differ by a whole hour, although there are instances, such as in Newfoundland...

7) daylight saving time. The Columbia Encyclopedia, Sixth Edition. 2001
...The amount of daylight on a given day of the year at a given latitude is fixed, but over the year the hours of sunrise and sunset vary from day to day. During the...

8) ephemeris time. The Columbia Encyclopedia, Sixth Edition. 2001
...The earth does not rotate with uniform speed, so the solar day is an imprecise unit of time. Ephemeris time is calculated from the positions of the sun and moon relative...

9) sidereal time. The Columbia Encyclopedia, Sixth Edition. 2001
...Because the earth moves in its orbit about the sun, the sidereal day is about 4 min shorter than the solar day (see solar time). Thus, a given star will appear to...

10) Greenwich mean time. The Columbia Encyclopedia, Sixth Edition. 2001
...Greenwich mean time, or Greenwich meridian time (GMT), the former name for mean solar time at the original site of the Royal Observatory in Greenwich, England, which...

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