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For iPhone 3GS, iPhone 4, and iPad on the iTunes App Store\n\nStar Guide's simple interface helps you learn the night sky by displaying the constellation at which your device is currently pointed.\n\nIt uses your device's sensor suite, the magnetometer, accelerometer, and GPS, to determine the orientation of your phone relative to the celestial sphere, using a custom cascading filter for precision and fast response. For best results hold the device at arms length, look along the surface, and tap the screen to pause the display\n\nNote that as an astronomy app, Star Guide comes in a red-and-black color scheme designed to minimize the loss of night-vision. For best results you should turn the screen brightness to minimum before going outside.

For iPhone, iPod touch, and iPad on the iTunes App Store\nThe first official NASA App invites you to discover a wealth of NASA information right on your iPhone or iPod Touch.\n\nThe NASA App collects, customizes and delivers an extensive selection of dynamically updated information, images and videos from various online NASA sources in a convenient mobile package. Come explore with us.\n\nFEATURES:\n\n* NASA Mission Information\n* Live streaming of the NASA TV public channel\n* Launch Information & Countdown clocks\n* Sighting Opportunities (Visible Passes for the ISS and Shuttle)\n* Mission Orbit Trackers\n* NASA Image of the Day\n* Astronomy Picture of the Day\n* NASAImages.org collection of images\n* NASA Videos\n* NASA Twitter Feeds/Mission Updates\n* Facebook® Connect for easy sharing\n* Integrated Twitter™ client

For iPhone, iPod touch, and iPad on the iTunes App Store\n3D SOLAR SYSTEM: play with the 3D model by moving around the Solar System. Zoom in, zoom out, investigate it from different angles. You can observe not only the current position of planets in our solar system but also learn their position at a definite period of time in the past or in the future! For this use Time Machine feature.\n\nFLY to the PLANET: having chosen a planet from a far, tap an image of a "rocket" to fly straight to the planet. Enjoy a beautiful and realistic image of a planet!\n\nREAD INFO about the planet: by tapping the "i" button you learn general info about the planet, its name, its mass, radius, distance to the sun, internal structure with the picture and science missions.\n\nTIME MACHINE: click on the clock icon and date and time will be displayed. Slide your finger on the scale and the sky will start moving accordingly. Touch year, month and time and change them depending on what you want to see, the display will adapt accordingly to show you how planets were aligned at that time.\n\nMOONS of DIFFERENT PLANETS: select a planet like Earth, Saturn, Jupiter, Mars or Urano and observe how many moons they have and their track around the planet. Select one of the moons and learn.

Star & Planet Finder guides you to see stars, planets, constellations and satellites in the sky. Simply choose a planet from the list, and move your device according to the pointer display, the pointer represents the planet.