Archive for January 2, 2018

01/02/2018 – Ephemeris – Cozying up to the Sun and a major meteor shower

January 2, 2018 Comments off

Ephemeris for Tuesday, January 2nd. The Sun will rise at 8:20. It’ll be up for 8 hours and 53 minutes, setting at 5:13. The Moon, 1 day past full, will rise at 6:18 this evening.

Today the Earth will reach its closest distance from the sun, of 91.4 million miles. This point in Earth’s orbit is called perihelion. The Earth varies about 3 million miles from perihelion to aphelion its farthest point from the sun, which usually occurs around July 4th or 5th. Perihelion doesn’t help warm our winters though, but it does make winter the shortest season because the Earth moves its fastest at perihelion. That makes summer the longest season by several days. Tomorrow afternoon will see the peak of the Quadrantid Meteor Shower. This active meteor shower has its radiant north of the kite shape of Boötes and near the handle of the Big Dipper but the bright Moon will interfere both tomorrow and Thursday mornings.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


Earth's orbit

The Earth’s orbit, somewhat exaggerated, showing perihelion and the seasons. Credit “Starts with a Bang” blog by Ethan Siegel.

While a planet’s distance from the Sun modify the seasons somewhat, seasons are always governed by the axial tilt of the planet with respect to the Sun.

Quadrantid Radiant

Facing the Quadrantid radiant at 6 a.m. January 3rd. Created using my LookingUp program.