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	Topics Astronomy Atomic clocks Bridges Calculators Earth's magnetic field Electricity Engineering Engines Fluids Gravity Lightning Measurement and real-life Miscellany Nobel Prize winners Optics Particle physics Physics meets biology Physics meets Earth science Scientist biographies Semiconductors and computers Sound Spacecraft Theme park physics Thermodynamics Tides Units of measurement		Topic: Gravity Be a satellite spotter See when satellites will be passing over your location. This site will also make sky charts. Find the value of g at your location Using your altitude and latitude, find the value of the acceleration of gravity at your location. Gravity maps of the Earth View 2-D and 3-D gravity maps of the Earth from the Gravity Recovery and Climate Experiment (GRACE) based at the University of Texas. The three-body problem The unsolvable three-body problem: How do you find the location of an object in a complicated gravitational system at any point in time? You can't!