Time
is one of the few Imperial or Standard measures still used in the Metric
System.
There are proposals for metric time where a day is divided into 10 hours;
an hour into 100 minutes; etc. but that is not in general use.
The shorter intervals like nanoseconds and femtoseconds are used in computers
and laser technology while light years and astronomical units are used
in space research.
There are 1,000 milliseconds in 1 second; 1,000 microseconds in 1 millisecond;
and so on.
NOTE:- A millisecond is one thousandth of a second, NOT one millionth.
fractions
of a second
metric
name
0,000
000 000 000 000 000 000 001
yoctosecond
[ ys ]
0,000
000 000 000 000 000 001
zeptosecond [ zs ]
0,000
000 000 000 000 001
attosecond
[ as ]
0,000
000 000 000 001
femtosecond [ fs ]
0,000
000 000 001 [ trillionth ]
picosecond
[ ps ]
0,000
000 001 [ billionth ]
nanosecond [ ns ]
0,000
001 [ millionth ]
microsecond
[ µs
]
0,001
[ thousandth ]
millisecond [ ms ]
0.01
[ hundredth ]
centisecond
[ cs ]
1.0
second [ s ]
seconds
to years
60 seconds
= 1 minute
[ mean solar ]
59.83617 seconds
= 1 minute [ sidereal
]
60 minutes
= 1 hour
24 hours
= 1 day
3,600
seconds
= 1 hour
86,400 seconds
= 1 day [ mean solar
]
86,164.09
seconds
= 1 day
[ sidereal ]
7 days
= 1 week
168 hours
= 1 week
14 days
= 1 fortnight
28, 29,
30 or 31 days
= 1 month
365 days
= 1 year
366 days
= 1 leap
year
12 months
= 1 year
31,536,000
seconds
= 1 year
[ calendar ]
31,558,150 seconds
= 1 year [ sidereal ]
31,556,930
seconds
= 1 year
[ tropical ]
9,460,550,000,000,000
metres
= 1 light year
299,792,458
metres per second ( m/s )
= speed of light
parsec
= approx. 3.25 light
years
year
intervals - anniversaries
number
of years
Biennial
2
Triennial
3
Quadrennial
4
Quinquennial
5
Hexennial
*
6
Septennial
7
Octennial
8
Novennial
9
Decennial
10
Hendecennial
*
11
Duodecennial
12
Tredecennial
*
13
Quindecennial
15
Sextodecennial
*
16
Septendecennial
17
Vigintennial
*
20
Trigentennial
*
30
Quadragennial
40
Quinquagenary
50
Sexagennial
*
60
Septuagennial
*
70
Septuagesiquintennial
*
75
Octogintennial
*
80
Nonagintennial
*
90
Centennial
100
Quasquicentennial
125
Sesquicentennial
150
Terquasquicentennial
or Septaquintaquinquecentennial *
175
Bicentennial
200
Quasquibicentennial
*
225
Semiquincentennial
*
250
Tercentennial
300
Semiseptcentennial
*
350
Quatercentenary
400
Quincentennial
500
Sexcentennial
*
600
Septcentennial
*
700
Octocentennial
800
Millenial
1,000
Quindecimillenial
15,000
Note:-
Interval names marked with a * do not appear in major dictionaries
but follow a logical linguistic progression. Thanks to Glenn
Kersten for the bulk of the data on anniversaries.
We have tried
to be accurate with the above table but cannot be held responsible for
inaccuracies.
Go back to first principals and double check your calculations if the
result is 'mission critical'.
Remember that
you cannot create energy only convert it. Likewise, you will not find
a conversion from pounds to metres - the basic units must remain the same
- mass converted to mass, length converted to length, et al.
You won't usually find a conversion from kilograms to grams - the prefix
'kilo' means '1,000' so a kilogram is in fact 1,000 grams in the same
way as a kilometer is 1,000 metres [or about 1,000 yards in 'old money'].
I have put a few in the tables because visitors have asked for them. More
prefixes can be found on another table.
One handy metric link between units to remember is that 1 Litre [1000cc]
of pure water weighs 1 kilogram.
If accuracy is critical beware of old versions of MS Excel which had problems
rounding off numbers.
