"The summer solstice, also called the estival solstice or midsummer, occurs when one of Earth's poles has its maximum tilt toward the Sun.
It happens twice yearly, once in each hemisphere (Northern and Southern).
For that hemisphere, the summer solstice is the day with the longest period of daylight and shortest night of the year, when the Sun is at its highest position in the sky.
At either pole there is continuous daylight at the time of its summer solstice.
The opposite event is the winter solstice."
Here, the sun doesn’t set between 20 April and 22 August."