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Distance Calculator Calculate the distance between two geographic coordinates using the Haversine formula. |

Nautical Units Converter This calculator converts various nautical measurement units. It includes conversions for speed and distance units. For speed, it can convert knots to miles per hour, kilometers per hour, feet per second or meters per second. For distance, it can convert nautical miles to miles, kilometers, cables, leagues, meters or feet. |

Earth Radius by Latitude (WGS 84) This online calculator calculates Earth radius at given latitude using WGS 84 reference ellipsoid |

Distance through the Earth This calculator calculates the distance from one point on the Earth to another point, going through the Earth, instead of going across the surface. |

Earth Distance Calculator The Earth Distance Calculator is a handy tool for measuring the distance between two points on the Earth's surface, as well as the distance between those two points if they were connected by a straight tunnel through the Earth's core. |

Conversion between Gauss planar rectangular coordinates and geographic coordinates and vice versa The page contains online calculators for converting from geographic coordinates to Gauss planar rectangular coordinates and back (the formulas for the Krasovsky reference ellipsoid are used). |

The length of arc of an Earth's parallel at a given latitude This online calculator converts the arc length of an Earth's parallel at a given latitude from degrees to meters. |