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− Subtraction = Calculate +/- Plus/minus toggles the pos/neg sign of the displayed number mc Memory clear mr Memory recall m- Memory minus m+ Memory plus CE Clear entry AC All clear √x Square root % Percentage π pi = 3.1415926536 x y Exponent R2 Round to 2 decimals (cents)
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NASA's terrain elevation data measure current height and changes in land altitude and are useful for creating digital elevation models.
Space-based platforms can be placed in several types of orbits around Earth. The three common classes of orbits are low-Earth orbit (approximately 160 to 2,000 km above Earth), medium-Earth orbit (approximately 2,000 to 35,500 km above Earth), and high-Earth orbit (above 35,500 km above Earth). Platforms orbiting at 35,786 km are at an altitude at which their orbital speed matches the planet's ...
The International Space Station (ISS) orbits Earth at an average altitude of approximately 420 kilometers (260 miles) above the Earth's surface. This altitude allows the ISS to remain in a stable ...
The layer that reaches the highest altitude in the Earth's atmosphere is the exosphere. It extends from about 700 km (440 miles) above the Earth's surface and gradually transitions into space.