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sidereal    
a. 星的,恒星的,以星球的运行为基准的

星的,恒星的,以星球的运行为基准的

sidereal
adj 1: of or relating to the stars or constellations; "sidereal
bodies"; "the sidereal system"
2: (of divisions of time) determined by daily motion of the
stars; "sidereal time" [ant: {civil}]

Sidereal \Si*de"re*al\, a. [L. sidereus, from sidus, sideris, a
constellation, a star. Cf. {Sideral}, {Consider}, {Desire}.]
1. Relating to the stars; starry; astral; as, sidereal
astronomy.
[1913 Webster]

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.
[1913 Webster]

{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.
[1913 Webster]


Month \Month\ (m[u^]nth), n. [OE. month, moneth, AS.
m[=o]n[eth], m[=o]na[eth]; akin to m[=o]na moon, and to D.
maand month, G. monat, OHG. m[=a]n[=o]d, Icel. m[=a]nu[eth]r,
m[=a]na[eth]r, Goth. m[=e]n[=o][thorn]s. [root]272. See
{Moon}.]
One of the twelve portions into which the year is divided;
the twelfth part of a year, corresponding nearly to the
length of a synodic revolution of the moon, -- whence the
name. In popular use, a period of four weeks is often called
a month.
[1913 Webster]

Note: In the common law, a month is a lunar month, or
twenty-eight days, unless otherwise expressed.
--Blackstone. In the United States the rule of the
common law is generally changed, and a month is
declared to mean a calendar month. --Cooley's
Blackstone.
[1913 Webster]

{A month mind}.
(a) A strong or abnormal desire. [Obs.] --Shak.
(b) A celebration made in remembrance of a deceased person a
month after death. --Strype.

{Calendar months}, the months as adjusted in the common or
Gregorian calendar; April, June, September, and November,
containing 30 days, and the rest 31, except February,
which, in common years, has 28, and in leap years 29.

{Lunar month}, the period of one revolution of the moon,
particularly a synodical revolution; but several kinds are
distinguished, as the {synodical month}, or period from
one new moon to the next, in mean length 29 d. 12 h. 44 m.
2.87 s.; the {nodical month}, or time of revolution from
one node to the same again, in length 27 d. 5 h. 5 m. 36
s.; the {sidereal}, or time of revolution from a star to
the same again, equal to 27 d. 7 h. 43 m. 11.5 s.; the
{anomalistic}, or time of revolution from perigee to
perigee again, in length 27 d. 13 h. 18 m. 37.4 s.; and
the {tropical}, or time of passing from any point of the
ecliptic to the same again, equal to 27 d. 7 h. 43 m. 4.7
s.

{Solar month}, the time in which the sun passes through one
sign of the zodiac, in mean length 30 d. 10 h. 29 m. 4.1
s.
[1913 Webster]


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  • Sidereal time - Wikipedia
    Both solar time and sidereal time make use of the regularity of Earth's rotation about its polar axis: solar time is reckoned according to the position of the Sun in the sky while sidereal time is based approximately on the position of the fixed stars on the theoretical celestial sphere
  • SIDEREAL Definition Meaning - Merriam-Webster
    The meaning of SIDEREAL is of, relating to, or expressed in relation to stars or constellations : astral
  • Sidereal time: What is it? - EarthSky
    Sidereal time measures the rotation of our planet relative to the stars It allows astronomers to keep time without worrying about the motion of Earth around the sun
  • What Is A Sidereal Year, And Why Is It Different From A . . . - IFLScience
    Simply put, a sidereal year – it’s pronounced sy-dear-ee-al, by the way, despite being spelled side-real – is the amount of time it takes for the planet to orbit the Sun once with respect to
  • SIDEREAL | English meaning - Cambridge Dictionary
    We divide this unit of time - the so-called sidereal day - into 24 hours, the hour into 60 minutes, the minute into 60 seconds
  • Sidereal - definition of sidereal by The Free Dictionary
    Of, relating to, or concerned with the stars or constellations; stellar 2 Measured or determined by means of the apparent daily motion of the stars: sidereal time [From Latin sīdereus, from sīdus, sīder-, constellation, star ] American Heritage® Dictionary of the English Language, Fifth Edition
  • Sidereal time | Celestial Coordinates, Celestial Sphere Equinoxes . . .
    The primary unit of sidereal time is the sidereal day, which is subdivided into 24 sidereal hours, 1,440 sidereal minutes, and 86,400 sidereal seconds Astronomers rely on sidereal clocks because any given star will transit the same meridian at the same sidereal time throughout the year
  • What does Sidereal mean? - Definitions. net
    Sidereal refers to anything related to stars or constellations More specifically, it is often used in the context of time measurement, where a sidereal day is the time it takes for the Earth to make one complete rotation in relation to the stars, which is approximately 23 hours, 56 minutes
  • SIDEREAL Definition Meaning | Dictionary. com
    Sidereal definition: determined by or from the stars See examples of SIDEREAL used in a sentence
  • What is Sidereal Time?
    Like the Solar Day, Sidereal Time is divided up into 24 hours, each with 60 minutes Each of these minutes have 60 seconds However, the Sidereal Day is a few minutes shorter than the Solar Day! That’s why Sidereal Time and Civil Time almost never match





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