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The longest day of the year

Sunset at the ancient site of Stonehenge in England. Photo: shutterstock

The summer solstice is the day when the sun is at its northernmost point

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On the first day of winter, the tilt of the earth means that the sun directly illuminates the latitude 23.5 degrees south, so less radiation reaches the northern hemisphere - the north pole is in total darkness.

December 21: the first day of winter - the shortest day of the year

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The Great Pyramid at Chichen Itzat in Mexico on the Vernal Equinox. From Wikipedia

Today is the first day of spring

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The earth in the four seasons in the northern latitudes in relation to the sun. Public domain illustration, from Wikipedia

The summer solstice - a short lesson in astronomy

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You were born in the summer, wear glasses

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A short guide to the summer sky

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Astronomical biological clocks

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