The Royal Sky

Every Fall, the royalty of the sky rises in the north-east and showcases a very fine part of the sky that includes the outer reaches of the band of the Milky Way, a galactic treasure, and a few easy-to-spot patterns that are easily visible in the night sky.

The Royal Sky

The trio includes Cepheus (the King), Cassiopeia (the Queen), and Andromeda (the Princess). In the early evenings this time of year, they are in a line from nearly due North toward due East, and the middle of these three constellations is quite bright and easy to locate in the sky. Over the course of the evening, they gradually shift position, spiraling out from the north circumpolar region of the sky toward the zenith, following closely the Great Square of Pegasus (of which Andromeda shares a corner star, Alpheratz).

I enjoy looking at this region through binoculars, with the outer reaches of the Milky Way visible in and around Cassiopeia, and of course the treasure of this part of the sky, the Andromeda Galaxy (M31).  Take some time to enjoy this royal corner of the night sky, brimming with discoveries small and large. 

Image courtesy of Sky Safari.

The Northern Sky: Circumpolar Stars and Polaris

I enjoy stargazing for many reasons, one of which is to get a sense of the motion of the sky as viewed from our vantage point here on Earth. As I have traveled around the globe, I've always tried to observe how the sky changes depending on where you view it from. One of the more fundamental things you can observe is the dynamic of the stars and constellations in the northern sky. For those of us who dwell in North America, we see the north star, Polaris, at the same height in the sky as we are located north of the equator. That is, for San Francisco at approximately 38 degrees north latitude, Polaris can be found due north, 38 degrees above the horizon.

For reasons you can read about in Wikipedia, Polaris does not move in the sky and therefore is never below the horizon. It is always fixed in the north above the horizon at the same arc as you are located north of the equator. However, the stars that surround Polaris also never dip below the horizon, but rather circle around Polaris in a 24-hour spiral that turns counter-clockwise. Long-exposure photographs show this effect very vividly.

Wonderful constellations and asterisms occupy the circumpolar region of the sky, including the Big and Little Dipper, Cassiopeia, Draco and Cepheus.