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The Summer Solstice

As the Earth orbits (and remains tilted at the same angle towards Polaris), on June 21st or June 22nd, the Northern Hemisphere leans towards the Sun. As a result, the Tropic of Cancer (23.5º North) receives direct insolation. The Summer Solstice is the longest day of the year (greatest daylight hours). The Sun reaches its highest altitude at solar noon on the Summer Solstice at latitudes equal or greater than 23.5º North.

The summer solstice marks the first day of summer.

Solstice translates to “sun stop”. The direct sun rays will not move any higher than 23.5º North, and therefore, this is the upper boundary of the direct insolation.