Name: SkySafari Pro
Rating: 4.8 (8864 reviews)

SkySafari Pro has the largest database of any astronomy app, period. It weighs in at half a gig, and contains over 15.3 million stars from the Hubble Guide Star catalog, plus 740,000 galaxies down to 18th magnitude, and over 550,000 solar system objects - including every comet and asteroid ever discovered.

Make sure you have at least 1 GB of free space on your SD card for SkySafari Pro to download this database from our server the first time it runs!

SkySafari Pro can point your GoTo or "Push-To" telescope anywhere in the sky, using your Android device's built-in WiFi or bluetooth, and our SkyFi wireless or Starry Night BlueStar bluetooth serial adapter.

SkySafari Pro accurately shows you the sky from any place on Earth, at any time up to 100 years in the past or future. It includes 1100 encyclopedic descriptions of the constellations, stars, and planets written by professional astronomers. And it contains over 800 images from NASA space missions, the Hubble Space Telescope, and the world's foremost astro-photographers.

If you have an Android device with a compass, SkySafari Pro can help you identify stars and planets by holding your phone next to them. Tap the Compass button (or tilt your phone up toward the sky) to activate the compass. Now, as you move the phone around, the sky chart follows your motion. Search for any object in the sky, and follow the arrow on screen to find it!

SkySafari has a "Night" button to preserve your dark adaptation as you're exploring the night sky. The Time Flow feature lets you animate the night sky using simple VCR controls - follow the motion of the stars and planets as SkySafari compresses days, months, and years into a few seconds.

SkySafari Pro's streamlined user interface puts the universe at your fingertips - and turns your Android into a 21st-century telescope controller. SkySafari is your celestial travel guide!

Why should you pay for SkySafari when Google SkyMap is free?

For starters, even the basic version of SkySafari includes ten times more star data than Google SkyMap. Our deep sky database contains thousands of NGC/IC objects, not just the 110-object Messier catalog. Our Pro version contains 550,000 solar system objects - including every known moon, asteroid, and comet in the solar system - not just the Sun, Moon, and nine planets (we're sentimentally still counting Pluto!)

Our apps contain hundreds of built-in images, and include thousands of object descriptions, written by professional astronomers. Google SkyMap gives you Wikipedia links - which don't do you much good when you're out in the field, away from Wi-Fi or data network connections.

Our Plus and Pro versions can control telescopes; Google SkyMap cannot. Google SkyMap cannot reproduce basic astronomical phenomena like lunar eclipses and Jovian satellite shadow transits. Our apps, by contrast, were developed by passionate astronomers with a penchant for quality and accuracy. We make a living from our products, and we stand by them.