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Precession, Nutation, and Coordinate Epochs
Grade Level
Astronomy
AST.058 Precession, Nutation, and Coordinate Epochs
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A planetarium app warns that a star chart from many centuries ago may not point exactly to today's pole. What is the best reason?
A
The Moon blocks the pole every time it is full.
B
The stars stop shining after a few centuries.
C
Precession slowly changes the celestial pole direction over long time spans.
D
Latitude and longitude replace all sky coordinates after 100 years.
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