epoch 音标拼音: ['ɛpək] ['ipək]
n . 新纪元,时代,时期
新纪元,时代,时期
epoch n 1 :
a period marked by distinctive character or reckoned from a fixed point or event [
synonym : {
era }, {
epoch }]
2 : (
astronomy )
an arbitrarily fixed date that is the point in time relative to which information (
as coordinates of a celestial body )
is recorded [
synonym : {
epoch }, {
date of reference }]
3 :
a unit of geological time that is a subdivision of a period and is itself divided into ages Epoch \
Ep "
och \ ([
e ^]
p "[
o ^]
k or [=
e ]"
p [
o ^]
k ;
277 ),
n . [
LL .
epocha ,
Gr . '
epochh `
check ,
stop ,
an epoch of a star ,
an historical epoch ,
fr . '
epe `
chein to hold on ,
check ; '
epi `
upon '
e `
chein to have ,
hold ;
akin to Skr .
sah to overpower ,
Goth .
sigis victory ,
AS .
sigor ,
sige ,
G .
sieg :
cf .
F .
['
e ]
poque .
See {
Scheme }.]
1 .
A fixed point of time ,
established in history by the occurrence of some grand or remarkable event ;
a point of time marked by an event of great subsequent influence ;
as ,
the epoch of the creation ;
the birth of Christ was the epoch which gave rise to the Christian era .
[
1913 Webster ]
In divers ages , . . .
divers epochs of time were used . --
Usher .
[
1913 Webster ]
Great epochs and crises in the kingdom of God .
--
Trench .
[
1913 Webster ]
The acquittal of the bishops was not the only event which makes the 30th of June ,
1688 ,
a great epoch in history . --
Macaulay .
[
1913 Webster ]
Note :
Epochs mark the beginning of new historical periods ,
and dates are often numbered from them .
[
1913 Webster ]
2 .
A period of time ,
longer or shorter ,
remarkable for events of great subsequent influence ;
a memorable period ;
as ,
the epoch of maritime discovery ,
or of the Reformation . "
So vast an epoch of time ." --
F .
Harrison .
[
1913 Webster ]
The influence of Chaucer continued to live even during the dreary interval which separates from one another two important epochs of our literary history . --
A .
W .
Ward .
[
1913 Webster ]
3 . (
Geol .)
A division of time characterized by the prevalence of similar conditions of the earth ;
commonly a minor division or part of a period .
[
1913 Webster ]
The long geological epoch which stored up the vast coal measures . --
J .
C .
Shairp .
[
1913 Webster ]
4 . (
Astron .)
(
a )
The date at which a planet or comet has a longitude or position .
(
b )
An arbitrary fixed date ,
for which the elements used in computing the place of a planet ,
or other heavenly body ,
at any other date ,
are given ;
as ,
the epoch of Mars ;
lunar elements for the epoch March 1st ,
1860 .
Syn :
Era ;
time ;
date ;
period ;
age .
Usage : {
Epoch }, {
Era }.
We speak of the era of the Reformation ,
when we think of it as a period ,
during which a new order of things prevailed ;
so also ,
the era of good feeling ,
etc .
Had we been thinking of the time as marked by certain great events ,
or as a period in which great results were effected ,
we should have called the times when these events happened epochs ,
and the whole period an epoch .
[
1913 Webster ]
The capture of Constantinople is an epoch in the history of Mahometanism ;
but the flight of Mahomet is its era . --
C .
J .
Smith .
[
1913 Webster ]
20 Moby Thesaurus words for "
epoch ":
Bronze Age ,
Dark Ages ,
Depression Era ,
Golden Age ,
Ice Age ,
Iron Age ,
Jacksonian Age ,
Middle Ages ,
New Deal Era ,
Prohibition Era ,
Silver Age ,
Steel Age ,
Stone Age ,
age ,
days ,
era ,
glacial epoch ,
interval ,
term ,
time 1 .
(Probably from astronomical timekeeping )
A term used originally in {Unix } documentation for the time
and date corresponding to zero in an {operating system }'s
clock } and {timestamp } values .
Under most Unix versions the epoch is 1970 -01 -01 00 :00 :00 GMT ;
under {VMS }, it 's 1858 -11 -17 00 :00 :00 (the base date of the US
Naval Observatory 's ephemerides ); on a {Macintosh }, it 's
1904 -01 -01 00 :00 :00 .
System time is measured in seconds or {ticks } past the epoch .
Weird problems may ensue when the clock wraps around (see
wrap around }), which is not necessarily a rare event ; on
systems counting 10 ticks per second , a signed 32 -bit count of
ticks is good only for 0 .1 * 2 **31 -1 seconds , or 6 .8 years .
The one -tick -per -second clock of Unix is good only until
2038 -01 -18 , assuming at least some software continues to
consider it signed and that word lengths don 't increase by
then . See also {wall time }.
2 . (Epoch ) A version of {GNU Emacs } for the {X Window
System } from {NCSA }.
Jargon File }]
2004 -06 -10 )epoch :
n . [
Unix :
prob .:
from astronomical timekeeping ]
The time and date corresponding to 0 in an operating system '
s clock and timestamp values .
Under most Unix versions the epoch is 00 :
00 :
00 GMT ,
January 1 ,
1970 ;
under VMS ,
it '
s 00 :
00 :
00 of November 17 ,
1858 (
base date of the U .
S .
Naval Observatory '
s ephemerides );
on a Macintosh ,
it '
s the midnight beginning January 1 1904 .
System time is measured in seconds or ticks past the epoch .
Weird problems may ensue when the clock wraps around (
see wrap around ),
which is not necessarily a rare event ;
on systems counting 10 ticks per second ,
a signed 32 -
bit count of ticks is good only for 6 .
8 years .
The 1 -
tick -
per -
second clock of Unix is good only until January 18 ,
2038 ,
assuming at least some software continues to consider it signed and that word lengths don '
t increase by then .
See also wall time .
Microsoft Windows ,
on the other hand ,
has an epoch problem every 49 .
7 days —
but this is seldom noticed as Windows is almost incapable of staying up continuously for that long .
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