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Revolution

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Earth’s orbit around the sun in 365.25 days.

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Rotation

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Earth spinning on its axis 24 hours a day.

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Earth’s Axis

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Is tilted at 23.5 degrees and is either towards or away from the sun half of the year.

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Vernal Equinox

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It is otherwise known as the Spring Equinox. It is on March 21.

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Autumnal Equinox

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Is otherwise known as the Fall Equinox. It is on September 22.

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Winter Solstice

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Is June 21 in the Southern hemisphere and December 21 in the Northern hemisphere.

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Summer Solstice

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Is December 21 in the Southern hemisphere and June 21 in the Northern hemisphere.

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Equinox

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Is when the day and night are exactly 12 hours long and the sun crosses the celestial equator.

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Solstice

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Is when the sun reaches its greatest distance North and South of the equator twice a year.

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June 21

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It is summer in the Northern hemisphere and the longest day. It is winter in the Southern hemisphere and the shortest day.