Great and Small Circles - SS1 Geography Lesson Note

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Great Circles

These are the largest circles that can be drawn on the Earth's surface and are formed by the intersection of the Earth and a plane that passes through its center. The Equator and all lines of longitude are great circles.

Source:(easyelimu.net)

Small Circles

These circles are formed by the intersection of the Earth and a plane that does not pass through the Earth's center. Examples include lines of latitude (except the Equator). Small circles are smaller than great circles and have varying circumferences.