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Webster 1913 Edition

Sidereal

Si-de′re-al

,
Adj.
[L.
sidereus
, from
sidus
,
sideris
, a constellation, a star. Cf.
Sideral
,
Consider
,
Desire
.]
1.
Relating to the stars; starry; astral;
as,
sidereal
astronomy
.
2.
(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
.
See under
Clock
,
Day
, etc.
–
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.
[L. sideralis, from sidus, a star.]
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.

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