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Introduction.¡ªIn 1960, Schiff  showed that an ideal
gyroscope in orbit around Earth would undergo two
relativistic precessions with respect to a distant inertial
frame:  a geodetic drift in the orbit plane due to motion
through the space-time curved by Earth¡¯s mass and  a
frame-dragging due to Earth¡¯s rotation. The geodetic term
matches the curvature precession of the Earth-Moon system
around the Sun given by de Sitter in 1916 . The
Schiff frame dragging is related to the dragging of the orbit
plane of a satellite around a rotating planet computed by
Lense and Thirring in 1918 . Frame dragging has important
implications for astrophysics; it has been invoked
as a mechanism to drive relativistic jets emanating from
galactic nuclei.
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