RISING AND SETTING OF THE SUN
What is Sun Set? What is Sun Rise? What are Cardinal Directions?
What is compass ? What is Sundial?
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| RISING AND SETTING OF THE SUN |
While
living on the Earth, we observe the rising of the Sun from the East and its setting
in the West. The Sun appears to be moving slowly from the East and setting in the
West. The next morning the Sun repeats this action.
Cardinal Directions
There
are four cardinal directions i.e. East, West, South and North. In the morning,
if we stand facing the rising Sun, East is in front of us, West is behind us,
South is at our right hand and North is at our left hand. An instrument is used
to find directions this is called a Compass. The needle of Compass always
points the North.
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| Cardinal Directions |
Determination of different locations
The
direction of different objects mentioned in the map can be understand easily according
to the coordinate in which they are present. The location of different places
shown on the map can be determined according to the cardinal directions. North
is at the top on the map, well is S located in the East, post office (PO) in
the West, playground in the North and garden in the South of the school.
Length of Shadow due to the movement of the Sun
The
shadow is formed when any obstacle comes in the way of sunlight. For example,
if any object comes in the way of sunlight, it blocks the small amount of
sunlight according to its volume and size. In this way, the shadow of that
object is formed. The length of shadow changes according to the movement of the
Sun. Observation shows it clear that in the morning and evening, the length of
shadow formed by the sunlight is longer (than the actual object) and at noon, shadow
becomes shorter.
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| Compass |
Determination of time with the help of the shadow of the Sun
Sometimes
we think about the ancient people. How did people estimate time when there were
no watches in olden days? At that time, people used to estimate time with the help
of the shadow of the Sun. In the morning after the sunrise, the shadow of an object
is longer in length. When the Sun gradually reaches to its highest point in the
sky, the shadow becomes shorter. By this, the ancient people estimated the time
that it was noon. When the Sun is setting, the length of the shadow gets longer
again. By this, the ancient people estimated that it was the time of afternoon
and evening. In ancient
times, an instrument was used to measure the shadow of the Sun which was called
Sundial.
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| Sundial |
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