Solar time - Wikipedia, the free encyclopedia
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Solar times are measures of the apparent position of the Sun on the celestial sphere. They are not actually the physical time, but rather hour angles, that is, angles expressed in time units. They ar...
en.wikipedia.org/wiki/Solar_time
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A solar day is the length of time between two successive passes of the sun across the same spot in the sky (e.g. crossing the meridian, overhead). That time period is, on average, 24:00:00, hours, or one mean solar day. A sidereal day is th...
http://wiki.answers.com/Q/Define_earth's_solar_and_side...
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Sidereal Days and Solar Days ... The sidereal day is defined to be the length of time for the vernal equinox to return to your celestial meridian. The solar day is defined to be the length of time for the Sun to return to your celestial meridian.
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csep10.phys.utk.edu/astr161/lect/time/timekeeping.html
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Demonstrates the difference between a sidereal and synodic (solar) day, which arises from the earth's revolution around the sun ... UNL Astronomy / ClassAction ... / Lunar Cycles / Animations...
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astro.unl.edu/classaction/animations/lunarcycles/synodi...
astro.unl.edu/classaction/animations/lunarcycles/synodiclag.html
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The length of time which passes between a given "fixed" star in the sky crossing a given projected meridian (line of longitude). ... The length of time which passes between a given "fixed" star in the sky crossing a given projected meridian (line of longitude). ... Day, Sidereal Month, Sidereal Period, Solar Day...
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scienceworld.wolfram.com/astronomy/SiderealDay.html
scienceworld.wolfram.com/astronomy/SiderealDay.html
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This makes the length of time for one solar day to be a little more than the true rotation rate of 23 hours 56 minutes with respect to the background stars. ... If the Earth rotated twice as quickly as it does now, what would be the difference in minutes between the solar and sidereal days? Explain how you got your answer.
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www.astronomynotes.com/nakedeye/s7.htm
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So, our clocks measure the length of time required for the Earth to rotate once with respect to the Sun. From our perspective, the Sun revolves around the Earth every 24 hours. This period is known as a solar day. ... As is the case with solar days, sidereal days are also divided into hours, minutes, and seconds.
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www.dur.ac.uk/john.lucey/users/e2_solsid.html
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Different kinds of days and their lengths. ... each sidereal hour into 60 sidereal minutes, and each sidereal minute into 60 sidereal seconds. As with solar days, the length of sidereal days is subject to irregularities in the Earth's rotation (see below), and so there is both an apparent sidereal day and a mean sidereal day.
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www.sizes.com/time/day.htm
www.sizes.com/time/day.htm
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In other words, the stars rise about 4 minutes earlier each day. Irregularities in the earth's rotation also affect the length of sidereal days; unlike atomic time, sidereal time is not absolute ... Why do the lengths of the solar and sidereal days differ?
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www.sizes.com/time/time_sidereal.htm
www.sizes.com/time/time_sidereal.htm
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