Seasons and the Elliptical Orbit
				q Seasons       Solstices: mark the longest and shortest days of the years (June 21 and December 21 in the northern hemisphere, the reverse in the southern)       Equinoxes: the length of night and day become equal in each hemisphere. q At the present-day orbit, the winter and summer solstices differ from the aphelion and perihelion by about 13 days.