Why the shadow short at noon?

Good relations from the sun to the earth in many sectors. We are blinders in the night. Sun rays rises in the day.

A man is in the sunlight. Carefully observe the position of the sun and the shadows of the man.

The length and the direction of the shadow change with changes in position and direction of the source of light. You will notice that as the sun appears to move across the sky from east to west say along A.B.C.D.E position the shows of the man also change accordingly, say A,’B,’C’,D’ and E’ respectively.

At noon, the shadow is very short. But in the morning and in the evening it is long. Why? At noon the sun is directly overhead. So, the sun rays fall vertically on the body. Hence, the shadow is very short. In the mornings and in the evenings, the run rays fall an inclined position. So, the shadows are long.

Villagers know the time by observing shadows. An apparatus which tells us the time from the length and the position of the shadows is called a `Sundial’. Sundials are still at Jantar Mantar in Delhi and in Jaipur.

Example

Take a long stick or an iron rod. Fix it vertically in the open ground. Mark its shadow just after the sunrise. Continue the same for every one hour until the sunset. Note the length and direction of the shadow for each observation. Record your observations in a table given.

Eclipses

When the planets or satellites block the light of the sun, their, shadows are formed on other planets or satellites. These shadows are called `eclipses’.

In olden days, people considered eclipses bad omen.

There are two types of eclipses. They are:

1) The solar eclipse and

2) The lunar eclipse.


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Comments (1)

  1. VENUGOPAL SREENIVASAN

The above observations seem to take so many things granted. The first one is that the Sun is something like an electric torch sending direct rays. Consider the size of the Sun and Earth and you will find that the observations are not exactly...

The above observations seem to take so many things granted. The first one is that the Sun is something like an electric torch sending direct rays. Consider the size of the Sun and Earth and you will find that the observations are not exactly right. Roughly speaking, the Sun with a diameter of 14,00,000 kilometers is extremely big when compared to the Earth with a negligible diameter of 12,750 km. The Sun is roughly 110 times of the Earth. Its like a football and gooseberry. So when at any point of time a gooseberry sized object is put at a distance of a football sized burning light there cannot be direct and slanting light on any part of the small object. The distance from the football to the center of the gooseberry or side of the gooseberry is almost the same. Sun at a rough distance of 150 Million Kilometers should actually give same amount of light all over the Earth because compared to the distance of Earth and Sun, the distance on the surface of the Earth from a central point to another point on any of the sides is negligible. If the observations in the above given article has to be true the Sun must be something like an optical device which directs light towards earth as if through a small area so that it functions like an electric torch and gives direct light when we are directly under it and slanting when not directly under. Can the Sun, as we see it presently, a lense like thing which conduits light from the burning helium football above?

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