Sidereal time - Wikipedia, the free encyclopedia
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Astronomers use sidereal time as a way to keep track of the direction in which their telescopes need to be pointed to view any given star in the night sky. Just as the Sun and Moon appear to rise in...
en.wikipedia.org/wiki/Sidereal_time
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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 sidereal day is 23 h 56 m 4.1 s, slightly shorter than the solar day because the Earth 's orbital motion about the Sun means the Earth has to rotate slightly more than one turn with respect...
scienceworld.wolfram.com/astronomy/SiderealDay.html scienceworld.wolfram.com/astronomy/SiderealDay.html
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.
csep10.phys.utk.edu/astr161/lect/time/timekeeping.html
Sidereal - Wikipedia, the free encyclopedia
The adjective sidereal can refer to various things, including: • Measurements of time: • Sidereal time • Sidereal day • Sidereal month • Sidereal year • Sidereal period of an object orbiting a star ...
en.wikipedia.org/wiki/Sidereal
Britannica online encyclopedia article on sidereal day:time required for a celestial body to turn once on its axis; especially the period of the Earth’s rotation. ... The sidereal day is the time required for the Earth to rotate once relative to the background of the stars—i.e., the time between two observed passages of...
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The sidereal day is the interval of time required for the hour angle of the equinox to increase by 360°. One rotation of the Earth with respect ... A sidereal day is approximately 23 hours, 56 minutes, 4.091 seconds, corresponding to the time it takes for the Earth to complete one rotation relative to the vernal equinox.
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sidereal day n. The time required for a complete rotation of the earth in reference to any star or to the vernal equinox at the meridian, equal to 23 ... Dictionary: sidereal day...
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name Marlene status student age 12 Question - What is a sidereal day? ----------------- The sidereal day is the time the Earth takes to rotate 360 degrees, that is in relation to the stars. It is 23 hours 56 minutes 4.09 seconds in length when one compares it with mean solar day which is 24 hours in length.
www.newton.dep.anl.gov/askasci/ast99/ast99544.htm
Solar and Sidereal Day ... Our clocks say that the day is 24 hours long, so the stars move around the Earth in 23 hours 56 minutes. This time period is called the sidereal day because it is measured with respect to the stars. ... Why is there a difference between the sidereal day and solar day?
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