Where is M13?
helps you visualize the 3-D locations and physical properties of common deep sky objects. If you examine the many astronomy books and software products on the market, you find that almost all of them focus on how the objects appear in the night sky, that is, on their apparent data. They treat the night sky as if it were a 2-D planetarium dome. Few discuss the physical aspects or locations of the deep sky objects you see. Where is M13? aims to address this important need. Using paired face-on and edge-on views of the Galaxy, it shows you where that cluster or nebula is actually located relative to the center and plane of the Galaxy — a three-dimensional perspective.


The Galaxy View shows paired face-on and edge-on views of the Galaxy. It is in this view that you can see the 3-D locations of deep sky objects.
The Object List, just below the paired images, shows important physical information about the objects listed. You can see the objects' galactic latitudes and longitudes as well as their luminosities, true sizes, and distances. With a quick click of a checkbox, you can toggle the information to show the equivalent apparent data: right ascension, declination, visual magnitude and apparent size.

The Sky View shows you where the objects you are displaying are located in the night sky, using a star map plotted in galactic coordinates.


Use of galactic coordinates, rather than the more common equatorial coordinates, helps you really understand the relationship between what you see in the night sky and an object's galactic location.

We think you'll find that Where is M13? literally adds another dimension to your night sky observing. Enjoy exploring this new perspective!