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 ]
48 Moby Thesaurus words for "
sidereal ":
Cynthian ,
anagalactic ,
asteroidal ,
astral ,
astrologic ,
astrologistic ,
astrologous ,
astronomic ,
astrophysical ,
celestial ,
circumplanetary ,
cislunar ,
empyreal ,
empyrean ,
equinoctial ,
extragalactic ,
galactic ,
heavenly ,
heliacal ,
intercosmic ,
interplanetary ,
intersidereal ,
interstellar ,
lunar ,
lunary ,
lunate ,
lunular ,
lunulate ,
meteoric ,
meteoritic ,
nebular ,
nebulose ,
nebulous ,
planetal ,
planetarian ,
planetary ,
planetesimal ,
semilunar ,
solar ,
sphery ,
star -
spangled ,
star -
studded ,
starry ,
stellar ,
stellary ,
terrestrial ,
uranic ,
zodiacal
安装中文字典英文字典查询工具!
中文字典英文字典工具:
复制到剪贴板
英文字典中文字典相关资料:
Sidereal time - Wikipedia Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the fixed stars " [1] A sidereal day (also known as the sidereal rotation period) represents the time for one rotation about the planet axis relative to the stars [2]
SIDEREAL Definition Meaning - Merriam-Webster The meaning of SIDEREAL is of, relating to, or expressed in relation to stars or constellations : astral
SIDEREAL Definition Meaning | Dictionary. com SIDEREAL definition: determined by or from the stars See examples of sidereal used in a sentence
Sidereal time: What is it? - EarthSky A sidereal day measures the rotation of Earth relative to the stars rather than the sun It helps astronomers keep time and know where to point their telescopes without worrying about where Earth
Sidereal Astrology Chart, Online Calculator | Astro-Seek. com Sidereal Astrology Charts Free Online Astrology Calculators Vedic Jyotish Horoscopes Sidereal Charts Birth Chart Transit Chart (Gochar) Solar Return Progressions (Ext settings) Synastry Chart (Kundli Matching) Sidereal vs Tropical Chart Dominant Planet Calculator Sidereal Tools and Tables Ayanamsa Calculator Sidereal Ephemeris Fixed Stars Tables Returns on Particular Degree Nakhsatra
SIDEREAL | English meaning - Cambridge Dictionary SIDEREAL definition: 1 of or calculated by the stars: 2 of or calculated by the stars: Learn more
The Three Types of Year: Sidereal, Tropical, Anomalistic The Sidereal year The sidereal year is the length of time it takes for the Earth to complete a single orbit, on average 365 256363 days However, the Earth’s orbital period and thus the length of the sidereal year can vary a little The gravitational pull of other planets can temporarily speed it up or slow it down in its orbit [2]
Sidereal time | Celestial Coordinates, Celestial Sphere Equinoxes . . . Sidereal time may be defined for any place on the Earth, but in the international system used by astronomers each sidereal day begins at the instant the vernal equinox transits the prime meridian The vernal equinox is the point on the celestial sphere at which the Sun crosses the plane of the Equator, moving from south to north
SIDEREAL definition and meaning | Collins English Dictionary 2 meanings: 1 of, relating to, or involving the stars 2 determined with reference to one or more stars Click for more definitions
Michael’s Miscellany: Sidereal Time - Astronomy Magazine So, sidereal time is defined as the right ascension of a “star” (real or imagined) which lies on your local meridian Sidereal time is not like time zones, where an entire area has the same time