06/20/2016 – Ephemeris – Summer will start later today
Ephemeris for Monday, June 20th. Today the Sun will be up for 15 hours and 34 minutes, setting at 9:31, and it will rise tomorrow at 5:57. The Moon, at full today, will rise at 9:32 this evening.
Well, this is it, the last 12 hours of spring. Summer will begin at 6:35 this evening. In the southern hemisphere the season of winter will begin, and the south pole of the Earth
will begin* is in the middle of its six months of darkness. The north above 66 ½ degrees north latitude is the land of the midnight Sun. Over summer that line will creep northward as the Sun heads southward. The seasons are caused by the tilt of the Earth’s axis, not by the Earth’s change in distance from the Sun. In fact we are approaching our farthest distance from the Sun, of about 94.5 million miles (152 million km) on the fourth of July called aphelion. The greater than normal distance makes summer the longest season at 93.7 days, winter being the shortest at 89 days.
Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
* Thanks to Jeff Silagy for spotting the error.