The shadows of trees are the shortest on Earth when the Sun is directly overhead (at the zenith). This happens only at [[solar noon The zenith is an imaginary point directly "above" a particular location, on the imaginary celestial sphere. "Above" means in the vertical direction opposite to the apparent gravitational force at that location. The opposite direction, i.e. the direction in which gravity pulls, is toward the nadir. The zenith is the "highest" point on the celestial sphere. Provided by Wikipedia
Published 2003
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