The summer solstice is when the sun is i'ts furthest away from the equator, making it the longest day of the year. It has been marked as the high point of summer – or midsummer – since at least the Neolithic era.
Some folk observe the solstice over three days.
For three days the sun will appear to stand still, each of the days equally long.
The word solstice is derived from the Latin sol ("sun") and sistere ("to stand still"), because at the solstices, the Sun's declination appears to "stand still"; that is, the seasonal movement of the Sun's daily path (as seen from Earth) pauses at a northern or southern limit before reversing direction.
Whilst summer solstice most commonly falls on June 21, it is not always on this date. It can also be anywhere between June 20 and June 22 depending on the sun's journey.

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