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Motions Of The Earth

Question 1:

Answer the following questions briefly.

(a) What is the angle of inclination of the Earth’s axis with its orbital plane?

(b) Define rotation and revolution.

(c) What is a leap year?

(d) Differentiate between the Summer and Winter Solstice.

(e) What is an equinox?

(f) Why does the Southern Hemisphere experience Winter and Summer Solstice in different times than that of the Northern Hemisphere?

(g) Why do the Poles experience about six months day and six months night?

Answer:

(a) The angle of inclination of the Earth’s axis with its orbital plane is 66½°.

(b) Rotation is the movement of the Earth on its axis.

Revolution is the movement of the Earth around the Sun in a fixed path or orbit.

(c) Earth takes 365¼ days to revolve around the Sun. However, for the sake of convenience, we consider a year as consisting of 365 days. The six hours (1/4th of 24 hours) that are ignored make one day (24 hours) over a span of four years. This surplus day is added to the month of February. Thus, every fourth year, February has 29 days, and such a year (with 366 days) is known as a leap year.

(d)

Summer Solstice

Winter Solstice

It is the position of the Earth when the rays of the Sun fall directly on the Tropic of Can...

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