The summer solstice occurs twice yearly and is a significant event celebrated with festivals and rituals around the world. It is the day with the longest period of daylight and the shortest night of the year in one hemisphere. The alignment of ancient monuments with the sunrise or sunset on the summer solstice is fascinating. The tables showing the length of the day in different parts of the world on the summer solstice are helpful in understanding its effects on different regions. https://en.wikipedia.org/wiki/Summer_solstice