Why does the summer solstice change?

Hailey Heseltine news@greenepublishing.com This year, summer solstice occurs this Friday, June 20, marking the official beginning of summer and the day of the year with the most sunlight for the Northern Hemisphere. Summer solstice typically falls somewhere between June 20 and 21.  Why is the date of the summer solstice not just the same day every year? The reason it fluctuates slightly is because of Earth's elliptical orbit, our Gregorian calendar, the differences between them and how