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The Earth and Time.
How is Time Measured?
Our time is measured according to the Earth's movement.
The Earth spins on its own axis.
The time
taken for one complete turn is called one
day.
The side of the Earth which is facing
the Sun is in
daylight,
on the other side it is night.
One day is divided equally into
24 hours.
Each hour is divided into 60 minutes, each minute into 60
seconds.
In addition to spinning on its own
axis, the Earth also orbits the Sun.
The time taken for one complete
orbit is called one year.
In this time, the Earth turns on its
axis 365·24
times.
There are 365 days in one year.
To account for the extra 0·24,
every four years an extra day is
added on to the end of February.
This is called a "leap
year".
Links
Earth
The Solar System
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