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Although the instant of the solstice can be calculated, direct observation of the solstice by amateurs is impossible because
the sun moves too slowly or appears to stand still (the meaning of
"solstice"). However, by use of astronomical data tracking,
the precise timing of its occurrence is now public knowledge. One
cannot directly detect the precise instant of the solstice (by
definition, one cannot observe that an object has stopped moving until
one later observes that it has not moved further from the preceding
spot, or that it has moved in the opposite direction.) Furthermore, to be precise to a single day, one must be able to observe a change in azimuth or elevation less than or equal to about 1/60 of the angular diameter of the Sun.
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