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The azimuth angle (or longitude) of a given position on Earth, commonly denoted by λ, is measured in degrees east or west from some conventional reference meridian (most commonly the IERS Reference Meridian); thus its domain (or range) is −180° ≤ λ ≤ 180° and a given reading is typically designated "East" or "West".
The coordinate of a point P is defined as the signed distance from O to P, where the signed distance is the distance taken as positive or negative depending on which side of the line P lies. Each point is given a unique coordinate and each real number is the coordinate of a unique point. [4] The number line
The analysis has been simplified by considering the attraction on only one side of the mountain. [22] A plumb-bob of mass m is situated a distance d from P, the centre of mass of a mountain of mass M M and density ρ M. It is deflected through a small angle θ due to its attraction F towards P and its weight W directed towards
iPad Front face of the last generation's flagship model, the iPad Pro (5th generation) Developer Apple Manufacturer Foxconn (on contract) Pegatron Type Tablet computer Release date April 3, 2010 ; 14 years ago (April 3, 2010) (1st generation) Units sold 677.7 million (as of 2022) Operating system iOS (2010–2019) iPadOS (2019–present) Connectivity WiFi, cellular, 30-pin dock connector ...
The only major change to the device between its announcement and being available to pre-order was the change of the behavior of the side switch from sound muting to that of a screen rotation lock. [23] The Wi-Fi version of the iPad went on sale in the United States on April 3, 2010. [22] [24] The Wi-Fi + 3G version was released on April 30.
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The shadow of Earth on the Moon during a lunar eclipse is always a dark circle that moves from one side of the Moon to the other (partially grazing it during a partial eclipse). The only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient Greeks deduced that this must mean Earth is spherical.
The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius" normally is a characteristic of perfect spheres, the Earth deviates from spherical by only a third of a percent, sufficiently close to treat it as a sphere in many contexts and justifying the term "the radius of the Earth".