During the launch and near‐earth phase, continuous radio tracking data were acquired from two Viking spacecraft as they receded from earth. Analysis of this data yielded these values for the geocentric gravitational constant GM: 398600.5±0.1 km3 s−2 for Viking 2. These values include the atomosphere of the earth and are consistent with the currently adopted speed of light (299792.458 km s−1).
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Pasquale Esposito (1979) studied this question.
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