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Turns and revolutions:
A turn through a right angle clockwise from North indicates a direction facing towards
East.
A turn through two right angles or a straight angle clockwise from North indicates a
direction facing towards South.
A turn through two straight angles clockwise from North indicates a direction facing
towards North (Original position).
Turning by two straight angles (or four right angles) in the same direction
makes a full turn. This one complete turn is called one revolution. The angle for one
revolution is a complete angle i.e. 360 degree.
Revolutions on faces of a clock.