Definify.com
Webster 1913 Edition
Sidereal
Si-de′re-al
,Adj.
1.
Relating to the stars; starry; astral;
as,
. sidereal
astronomy2.
(Astron.)
Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars;
as, the
sidereal
revolution of a planet; a sidereal
day.Sidereal clock
, day
, month
, year
Sideral time
, time as reckoned by sideral days, or, taking the sidereal day as the unit, the time elapsed since a transit of the vernal equinox, reckoned in parts of a sidereal day. This is, strictly, apparent sidereal time, mean sidereal time being reckoned from the transit, not of the true, but of the mean, equinoctial point.
Webster 1828 Edition
Sidereal
SID'ERAL
, SIDE'REAL,Adj.
1.
Pertaining to a star or stars; astral; as sideral light.2.
Containing stars; starry; as sidereal regions. Sidereal year, in astronomy, the period in which the fixed stars apparently complete a revolution and come to the same point in the heavens.Definition 2024
sidereal
sidereal
English
Alternative forms
Adjective
sidereal (not comparable)
- Of or relating to the stars.
- 1919, Hector Macpherson, S.Chapman (series editor), Men of Science: Herschel, Chapter V,
- The field of sidereal astronomy, therefore, was virtually untrodden when, shortly after the beginning of his telescopic work, Herschel began his first review of the heavens.
- 1919, Hector Macpherson, S.Chapman (series editor), Men of Science: Herschel, Chapter V,
- (astronomy) Relating to a measurement of time relative to the position of the stars.
- 1903, Percival Lowell, The Solar System, Chapter I,
- Then, from a sufficient number of observations of synodic periods to give their mean, we obtain the sidereal period, or period with reference to the stars.
- 1903, Percival Lowell, The Solar System, Chapter I,
- (astronomy) Relating to a measurement of time relative to the point of the vernal equinox.
Translations
of or relating to the stars
relating to a measurement of time relative to the position of the stars
Derived terms
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