If in the evening you are dreaming of watching the stars, while it is pouring cats and dogs outside, then the Open Source Stellarium application is for you.
To install it, follow the procedure:
Download the following frameworks:
*SDL-1.2.10.dmg
*SDL_mixer-1.2.7.dmg
*SDL_image-1.2.5.dmg
Install them in /Library/Frameworks.
Then download Stellarium. http://stellarium.sourceforge.net/
You will then get a representation of the sky and the milky-way depending on your location.