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“sidereal”
sidereal
1. A reference to the stars or constellations: "sidereal bodies".
2. Relating to the stars, especially measured with reference to the apparent motion of the stars.
3. Divisions of time; determined by daily motion of the stars: "sidereal time".
2. Relating to the stars, especially measured with reference to the apparent motion of the stars.
3. Divisions of time; determined by daily motion of the stars: "sidereal time".
In astronomy, relating to the period of time based on the apparent rotation of the stars, and therefore equivalent to the rotation of the body from which the observation is made. On earth, a sidereal year is 365.256 times the sidereal day of 23 hours, 56 minutes and 4 seconds.
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sidero-, sider- (star)
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(the sidereal and the synodical month)
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“sidereal”
The time it takes for a planet or satellite to make one complete circuit of its orbit (360°) relative to the stars: "The Earth's sidereal period, or sidereal year, is equal to 365.2564 mean solar days."
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hodo-, hod-, od-
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sidero-, sider- (star)
(page 2)
sidereal time
The measure of time defined by the apparent diurnal motion of the catalog equinox; hence, a measure of the rotation of the earth with respect to the stars rather than the sun.
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sidero-, sider- (star)
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Word Entries at Get Words containing the term:
“sidereal”
sidereal period
The time required for a celestial body in the solar system to complete one revolution with respect to the fixed stars (as observed from a fixed point outside the system).
A planet's sidereal period can be calculated from its synodic period or the length of time during which a body in the solar system makes one orbit of the sun relative to the earth.
The sidereal period of the moon or an artificial satellite of the earth is the time it takes to return to the same position against the background of stars.
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Astronomy and related astronomical terms
(page 23)
sidereal time, sidereal day
1. Time that is measured by the stars rather than by the sun.
2. A unit of time used in astronomy, equal to the period of time in which the earth makes one rotation relative to the stars.
3. The time taken between successive meridian passages of the same star (23 hours, 56 minutes, 4.091 seconds).
2. A unit of time used in astronomy, equal to the period of time in which the earth makes one rotation relative to the stars.
3. The time taken between successive meridian passages of the same star (23 hours, 56 minutes, 4.091 seconds).
The sidereal day is about four minutes shorter than the twenty-four hours of the solar day.
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Astronomy and related astronomical terms
(page 23)