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To measure a star's parallax angle correctly, you should observe a star's location against background stars

Votes
on one night.0 %
0
on two nights separated by one years.0 %
0
on two nights separated by 6 months.6 %
1
on many nights over the course of 6 months.13 %
2
on many nights over the course of a year.81 %
13

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