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Mounts, Tracking, and Earth’s Rotation
Grade Level
Astronomy
AST.081 Mounts, Tracking, and Earth’s Rotation
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Which observing plan most clearly minimizes both drift and field rotation for a long exposure?
A
Turn off tracking so the telescope does not vibrate.
B
Use only a level alt-az mount and ignore rotation.
C
Use a fixed tripod and crop the trails afterward.
D
Polar-align an equatorial mount, balance it, and track at the sidereal rate.
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