Astrology fans might be excited at the future guesswork, but it's astronomy fans in for the real treat with this week. Originally developed under the name "Star Droid," the app lets you view a labeled map of the sky through your Android-powered phone. The program uses a combination of GPS data, compass data, and date and time information to help you identify stuff in space right from your screen.

"The result is a whole new sky mapping experience," says Googler Dom Widdows, who bears the impressive title of differential geometer.

In addition to letting you identify what you're seeing, Google Sky Map can help you search for specific stars, planets, or constellations. Type in "Saturn," for example, and your phone will direct you to its current location. The display will update as you move around, too, letting you pinpoint the planet's exact placement.

"The phone can't 'see' the stars as such -- it works out their positions mathematically from the sensor readings," Widdows explains. "It will just as reliably display stars you can't see on a cloudy night ... [or] stars you can't see because you're indoors."

Google Sky Map for Android is now available in the Android Market. You can also check it out in action via the demo video below.