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
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