Question

Which of the following factors could be related with the change in the position of the shadow of the stick and the difference in the duration of daytime?
1) Rotation of the earth
2) Distance between the earth and the sun
3) Revolution of the earth
4) The axis of the earth.

Answer 1

1)Rotation of the earth: Rotation of earth results seasonal variation.

Accordingly relative poison of earth with respect of sun varies.

So, shadow of stick will also vary.

2)Distance between earth and sun: earth moves round the sun in an elliptical orbit, So distance between sun an Earth varies.

Accordingly, length of the shadow will vary.

3) Revolution of the earth: It creates day and night with movement of shadow of the stick vary with time and null in night.