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BLITS is tracked to high precision by the International Laser Ranging Service (ILRS), and IPIE had detected a sudden decrease of 120 meters in the semi-major axis of its orbit and a change in its spin velocity and attitude, the universe today reported.
These are the semi-major axis of orbit and argument of perigee (see Table 2).
6 Sagnac in elliptical orbit of known inclination If now a satellite is carrying a Sagnac device is in an elliptical orbit of eccentricity e and semi-major axis a we have that the radial orbital vector and the orbital velocity are given by: r(f)= a(1 - [e.