atomic unit of time blinks days days (sidereal) fortnights hours Jordan's elementary time microseconds milliseconds minutes months (30 days) months (sidereal) months (solar mean) months (synodic), lunar month nanoseconds seconds shakes weeks winks years (astronomical), Bessel year years (calendar) years (sidereal) years (solar mean) years (tropical)

Unit Name	Symbol	SI Equivalent s
atomic unit of time	a.u.	2.41888432650516 x 10-17 s
blink		0.86400000000000 s
day	d	8.64000000000000 x 10+4 s
day (siderial)	d (sider.)	8.61640905000000 x 10+4 s
fortnight		1.20960000000000 x 10+6 s
hour	h	3600 s
Jordan's elementary time		9.39960000000000 x 10-24 s
microsecond	µs	1 x 10-6 s
millisecond	ms	1 x 10-3 s
minute	min	60 s
month (30 days)		2.592000000000000 x 106 s
month (sidereal)		2.36059 x 10+6 s
month (solar mean)		2.628 x 10+6 s
month (synodic), lunar month		2.55144 x 10+6 s
nano second	ns	1 x 10-9 s
second	s	1 s
shake		1x10-8 s
week	w	6.048x10+5 s
wink		3.33333333333333 x 10-10 s
year (astronomical), Bessel year	a astr.	3.16877865764199 x 10+7 s
year (calendar)	a, y	3.17097900029082 x 10+7 s
year (sidereal)		3.16875857545289 x 10+7 s
year (solar mean)	a, y	3.16880878140289 x 10+7 s
year (tropical)	a trop.	3.16887907240572 x 10+7 s