The Galaxy View is displayed by default the first time you run Where is M13?. It shows paired face-on and edge-on views of the Galaxy with the face-on view being an artists rendition based on recent data from the Spitzer Space Telescope. Starting with release 2.3, Where is M13? uses the new "two armed" rendition of the Galaxy fro Spitzer.
In this view, the Sun is depicted as a yellow dot to the left of the galactic center and deep sky objects are depicted in their locations relative to the Sun and the Galaxy as a whole. Neither the Sun nor the objects are drawn to scale. Instead, they are shown as substantially larger than they would be relative to the Milky Way Galaxy.
The symbols used to represent the various objects are:
As you check or uncheck the Show box for an object in the Object List, it will be added or removed from the two views. You may also use the Find command to automatically locate and show an object.
The views can be scrolled using either the scroll bars, or by directly clicking and dragging either image. The two views are coupled so that they are scrolled simultaneously. By double clicking in either view, the location clicked is automatically centered in the view.
You can zoom in and out in the Galaxy View by dragging the slider to the left of the face-on view. You can achieve very fine control, often needed when zoomed far out to see other galaxies, by first clicking the zoom slider to give it keyboard focus and then using your keyboard's arrow keys to zoom in and out. You can also zoom in and out by rotating the mouse's scroll wheel while the mouse pointer is positioned over either view.
By default, Where is M13? uses a colored galactic image on a black background. However, by checking the Black on White checkbox at the bottom of the main window, you may invert the image to black on a white background. This is particularly useful for conserving black ink while printing.
Note that objects in the left, face-on view are always drawn overlaid on the galactic disk so they will be visible. This does not imply that the object is actually in the northern galactic hemisphere. You should consult the right, edge-on view to see which hemisphere the object is actually in. In general, the front to back ordering of objects in the Galaxy View is not related to physical location; in fact, when an object is selected, it is brought to the top of the order to ensure it is not hidden beneath other objects.