## The Earth's Longitude Gravity Field as Sensed by the Drift of Three Synchronous Satellites |

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24-hour satellite acceleration according actual data addition adjusted appears Appendix Argument Ascending Equator Crossing Average bias biases bracketed calculated close coefficients day2 degrees/day degrees/sid derived determined drift rate Early Bird earth gravity earth longitude gravity earth radii east-west effects Equator Crossing East equatorial equilibrium error of estimate experiment Figure fit of data fourth order Free Drift Arc Geographic Longitude geoid given gives gravity constants gravity field GSFC harmonics higher order Inclination initial elements January least squares fit limited listed long term maximum mean measured model bias noted Number observations orbit data perturbations precision presented rad/sid record Reduced Reference Related reported resonant resonant gravity Results of least samples second order Semimajor Axis shows simulated Simulated Syncom solar stage standard synchronous Syncom Table 12 tests theoretical theory of Equation third order tion Tracking Epoch trajectory values