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Earth’s revolution refers to the movement of the earth around the sun. The earth takes 365 ¼ days for a complete revolution. When the earth takes 366 days to accomplish one revolution is called a Leap year.

The earth revolution revolve around the sun in an elliptical.Due to the shape of the earth’s orbit, the earth is very closer to the sun at one point of the year than at another. The effects of the Earth’s revolution includes:-

(a) Seasons of the year; Season is one of the four periods of the year separated from each other by different temperature conditions. The seasons are summer, autumn, winter and spring. They are more pronounced between 23 0 c and 66 0 c of latitudes. At the equator the year is divided between hot and wet seasons while at the poles is very cold all the year around and the season cannot be identified easily.

The Northern hemisphere summer months are May, June and July. Autumn months are August, September and October, Winter Months are November, December and January while spring months are February, March and April. In the Southern Hemisphere summer months are November, December and January, Autumn months are February, March and April Winter has May, June and July while spring months are August , September and October.

(b) Eclipse; This is the movement of one heavily body between the two others, such that it casts shadow over the other. The eclipse involves three heavily bodies namely; the Sun, the Earth and the Moon.

(c) Difference in the length of day and night; Places along the equator experience equal day and night all the year, but northwards or southwards towards the poles, the length of the day and night vary with latitudes for instance in northern summer when the northern hemisphere is inclined towards the sun, days are longer than nights.

(d) Change of midday sun in the latitudes; Parallels are more commonly known as Latitudes Latitude/Parallel Is an imaginary line drawn on map from west to east and forms a circle. It measured in degree minute and seconds of a point on the earth’s surface north or south of the earth from the equator. The equator is the latitude which divides the earth into two equal hemisphere, one in the north and other in the south. Meridians Are commonly known as longitude Longitude/Meridian, Is angular distance measured in degrees East or west of the prime meridian, they run from north to south.

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