The Autumnal equinox marks the point in the calendar at which the length of night and the length of day are equal.

At noon the sun is directly above the Equator (0°), and at other location, the angle of the Sun is equal to the latitude of this location. We use those obesvations to calculate the circumference of the Earth.

Garmisch-Partenkirchen

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Dnipro

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Lafrançaise

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Dorohoi

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Ilion