How can I tell what the star, or planet, is in the nighttime sky?

There are a number of tools available.

Stellarium is free software that will show you want is in the sky.

And astronomy.com has a "Your Sky Tonight" feature that will tell you as well.

Not by address but by city (the stars you see at your address are the same stars that are seen a few miles away).

I have an app on my phone that uses GPS to find you. Sky View. I got it free. You just point your phone around at the sky and the view changes to show you what you're looking at. Then you can click on a star or whatever and it will bring up the information on it.

There's apps like Google Sky and Skymap that you can install on your android phone. I deinstalled Google Sky cause it couldn't seem to track which direction I was pointing in very well. Skymap is a huge install so I'm hesitant about installing it on my little phone. Get a phone like a Nexus rather than a Samsung, moving apps to the sdcard on Samsungs requires that you root it.

This web site carries a downloadable monthly star map:

http://skymaps.com/

This site lets you enter your location, and then time and date to generate a sky map:

http://www.heavens-above.com/

There are also many software programs that do this; I use Starry Night myself.