No comments | Wednesday, September 05, 2012
Time
Different units of time:
Below are some of the words used to define units of time:
Chronon is one-billionth of a trillionth of a second (the time of a photon would take to cross the width of 1 electron at the speed of light).

femtosecond is 0.000000000000001 of a second

Picosecond is measured as one-trillionth of a second

Nanosecond is one-millionth of a second

A millisecond is one- thousandth (0.001) of a second: the blink of an takes 50-80 milliseconds

centisecond is one-hundredth (0.01) of a second

Second is 1/60 of a minute

1 minute = 60 seconds

1 hour = 60 minutes

Day- Sunrise to sunset, or midnight to midnight or sunset to sunset= 24 hours

Week = seven days, also known as seven nights or sennight in Shakespearean times

Fortnight = two weeks (from the old English for 14 nights)

Month- full Moon to full Moon, 1/12 of a year, four weeks or 28,29,30 or 31 days depending on the month

bimester - two months

trimester - a period of 3 months

year - 365 days, 12 months or 52 weeks

Solar day - The time it takes for a place on the Earth directly facing the Sun to make one revolution and return to the same position (approx. 23 hours 56 minutes)

Solar year- The time taken for the Earth to make a complete revolution around the Sun equal to 362.24219 solar days or 365 days 5 hours 48 minutes 45.51 seconds, also called a astronomical or tropical year.

Leap year= 366 days

decade= 10 years, also known as decennium

century= 100 years

millennium= 1,000 years also called as chiliad

bimillennium= 2,000 years

Era is a period of time measured from some important event

eon or aeon is a long period of time, usually thousands of years, it is one-billion year in geology and astronomy

epoch is a very long period of time or a geological era.


Leap seconds:
The rotation of the Earth is slowing down which means that a solar day (the time it takes the Earth to make one complete revolution) and the time shown by atomic clocks would constantly diverge. This problem has been solved by adding leap seconds. Since 1072, there have been 22 leap seconds. The last one was added on 31 December 2005, which delayed New Year's day 2006 by one second.

Naming the days of the week:
The days of the week are called after planets and other objects saw in the sky by the Ancient Babylonians, the the Romans.

Monday is the Moon's day
Tuesday is Tiu's day, Mars or the Roman god of war adopted as the great warrior Tiw or Tiu in Scandinavian mythology.
Wednesday is Woden's day
Thursday is Thor's day, Thor was the god of Thunder
Friday is Freyja's day like Venus. Frigg or Freyja was the goddess of love.
Saturday is Saturn's day
Sunday is the Sun's day

Calendar:
The Gregorian Calendar is used by most of the world's countries and culture, but some base their calendars on more ancient systems. An alternative calendar has adopted by other countries at some point in their history.

3761 BC Jewish calendar starts
2637 BC Original Chinese calendar starts
45 BC Roman Empire adopted Julian Calendar
0 Christian Calendar starts
79 Hindu Calendar starts
597 In Britain Julian calendar adopted
622 Islamic calendar starts
1582 Gregorian calendar introduced in Catholic countries
1752 Julian calendar abandoned, Gregorian calendar
adopted in Britain and its colonies, including
America
1873 Gregorian calendar adopts by Japan
1949 Gregorian calendar adopts by China

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