They occur when the Sun reaches its highest or lowest point in the sky.They affect the amount of sunlight in the Northern Hemisphere in June.They influence the cycling of different seasons based on the Sun's height in the sky.
Explanation:
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, around June 21 and December 21.