Celestial Sphere App

Hi all,

I just wanted to let you know that if you're having a hard time visualizing the celestial sphere when you look up in the night sky, well, there's an app for that.  In fact there are scores of apps that use your position and orientation to show you what is in the night sky behind your smart phone (or tablet).

The app I use is called Pocket Universe.  You can turn on a grid of lines of constant RA and Dec to help you visualize the night sky.

Hope this helps!