With the help of a diagram show how the tilt of the Earth's axis and the revolution causes (i) seasons: (ii) variation in the length of day and night.

Draw a diagram of the position of the Earth on December 22. Draw and name the Equator, Arctic Circle, and Antarctic Circle.

Draw a neat sketch to show the phenomenon of day and night.

Draw a labelled, self-explanatory diagram of the Summer Solstice in the Northern Hemisphere.