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Spring is one of the four seasons of temperate zones. Astronomically, it begins with the spring equinox (around 21 March in the Northern hemisphere, and 23 September in the Southern hemisphere), and ends with the summer solstice (around 21 June in the Northern hemisphere and 21 December in the Southern hemisphere). However, sometimes it is counted instead as the whole months of March, April and May in the Northern hemisphere and September, October and November in the Southern hemisphere.

See also: axial tilt.

A spring is a flexible elastic object used to store mechanical energy. The most common types of spring are helical spring[?], coil spring[?], and leaf spring[?], and they are commonly made out of steel or brass. See also Shock absorber.

A spring is a place where an underground stream flows out of the ground. By analogy, a fountain[?] can also be called a spring. See also hot spring, well, source.

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