World Geodetic System Wikipedia

Geodetic Reference System 1980 - Wikipedia.

The 1980 Geodetic Reference System (GRS 80) posited a 6 378 137 m semi-major axis and a 1 / 298.257222101 flattening. This system was adopted at the XVII General Assembly of the International Union of Geodesy and Geophysics in Canberra, Australia, 1979. The GRS 80 reference system was originally used by the World Geodetic System 1984 (WGS 84 ....

https://en.wikipedia.org/wiki/Geodetic_Reference_System_1980.

U.S. National Geodetic Survey - Wikipedia.

The National Geodetic Survey (NGS), formerly the United States Survey of the Coast (1807-1836), United States Coast Survey (1836-1878), and United States Coast and Geodetic Survey (USC&GS) (1878-1970), is a United States federal agency that defines and manages a national coordinate system, providing the foundation for transportation and communication; mapping and charting; ....

https://en.wikipedia.org/wiki/U.S._National_Geodetic_Survey.

Earth - Simple English Wikipedia, the free encyclopedia.

Earth is the third planet of the Solar System.It is the only planet known to have life on it. The Earth formed about 4.5 billion years ago. It is one of four rocky planets on the inner side of the Solar System.The other three are Mercury, Venus, and Mars.. The large mass of the Sun keeps the Earth in orbit, just as the mass of Earth keeps the moon moving around it..

https://simple.wikipedia.org/wiki/Earth.