Archive for November 23, 2018

11/23/2018 – Ephemeris – The Moon and Aldebaran

November 23, 2018 Comments off

Ephemeris for Friday, November 23rd. The Sun will rise at 7:50. It’ll be up for 9 hours and 17 minutes, setting at 5:07. The Moon, at full today, will rise at 5:55 this evening.

Tonight’s full Moon will be accompanied by the bright star Aldebaran, the angry red eye of the constellation Taurus the Bull. Earlier this year we had the last of nearly two years of the Moon every month passing in front of Aldebaran. The tilt of the Moon’s orbit with respect to the Earth’s own orbit of the Sun slides slowly westward with time, so The Moon won’t pass in front of Aldebaran for those of us on Earth again until 2033. This sliding of the Moon’s orbit is called regression of the nodes. A node is where the Moon’s orbital plane crosses the Earth’s. These are places eclipses of the Sun and Moon occur if lined up with the full or new moons. Why regression? The nodal points are moving westward, backward of most motions in the solar system.

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


Full moon with Aldebaran
Tonight’s full moon with Aldebaran in the face of Taurus the bull (8 p.m. November 23, 2018). Created using Stellarium.