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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
41-6 Time and Frequency
Before the invention of atomic clocks and the acceptance of atomic time, the second was dened by
usi
ng
as
tronomical
ti
me
sc
ales
. e as
tronomical
de
nitions
of th
e
se
cond
we
re
ve
ry
di
erent
fr
om
th
e
ato
mic
de
nition
. In
stead
of mu
ltiplying
th
e
pe
riod
of a sh
ort
ato
mic
ev
ent
to fo
rm
a lo
nger
ti
me
in
ter-
val,
th
e
ea
rly
de
nitions
of th
e
se
cond
we
re
ba
sed
on di
viding
th
e
pe
riod
of a lo
ng
as
tronomical
ev
ent
to
fo
rm
a sh
orter
ti
me
in
terval
. e
re
wa
s
no o
cial
me
trological
de
nition
of th
e
se
cond
un
til
th
e
SI wa
s
fo
rmed
in 19
60
. Ho
wever,
pr
ior
to th
at
da
te,
th
e
se
cond
wa
s
ob
tained
by di
viding
th
e
me
an solar day
or
th
e
av
era
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Publisher Resources

ISBN: 9781439848913