By Giulio Avanzini

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8◦ E. Although used quite often for launches of smaller Cosmos satellites during the 1960s, the number of launches from this site fell dramatically during the 1970s and 1980s to about one orbital launch per year. 0 degrees. 0 degrees) was planned during the 1990s to accommodate the new modular Angara launch vehicles in the medium and heavy categories, as the break-up of the Soviet Union left the main Russian launch site (Baikonur) on foreign territory, while Plesetsk Cosmodrome did not have facilities for large launch vehicles and was not suited for support of launches into lower-inclination orbits.

7 permits the evaluation of the time of passage at the selected anomaly. The r and v components in the geocentric-equatorial (or heliocentric-ecliptic) frame can be obtained using a coordinate transformation. 7 Coordinate Transformation The more general problem of coordinate transformation is presented here for the specific case of passage from perifocal to geocentric–equatorial components, but the approach can be extended to change of reference between any pair of mutually orthogonal triads of unit vectors in a three– dimensional space.

The zonal harmonics, which describe the deviation in the North–South direction, are dependent on latitude only. The tesseral and sectorial harmonics causes the deviation in the East–West direction; the former are dependent on both latitude and longitude, the latter on longitude only. The terms with n = 1 are absent, as the center of the frame and the center of mass of the Earth coincide. The even numbered zonal harmonics are symmetric about the equatorial plane and the odd numbered harmonics antisymmetric.

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