when does the summer solstice occur in the northern hemisphere
Summer solstice The summer solstice occurs during the hemisphere's summer.[2] This is the June solstice in the Northern Hemisphere and the December solstice in the Southern Hemisphere. Depending on the shift of the calendar, the summer solstice occurs some time between June 20 and June 22 in the Northern Hemisphere[3][4] and between December 20 and December 23 each year in the Southern Hemisphere.[5] The same dates in the opposite hemisphere are referred to as the winter solstice.
Winter solstice The winter solstice (or hibernal solstice), also known as midwinter, is an astronomical phenomenon marking the day with the shortest period of daylight and the longest night of the year. In the Northern Hemisphere this is the December solstice and in the Southern Hemisphere this is the June solstice.
Solstice A solstice is an event occurring when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, on about 21 June and 21 December. The seasons of the year are directly connected to both the solstices and the equinoxes.
Midnight sun At the poles themselves, the sun rises and sets only once each year on the equinox. During the six months that the sun is above the horizon, it spends the days continuously moving in circles around the observer, gradually spiralling higher and reaching its highest circuit of the sky at the summer solstice.