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The Quadrantid meteor shower has a zenithal hourly rate (ZHR) of , meaning that at the shower's peak, meteors per hour could potentially be seen by a hypothetical observer. A calculation that assumes ideal viewing conditions,
|Question 17Verbal
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Which choice completes the text so that it conforms to the conventions of Standard English?
the number of meteors an actual viewer observes in an hour may differ.
A
there may be a considerable difference between the number of meteors an actual viewer observes in an hour and the ZHR.
B
an actual viewer's observed number of meteors in an hour and the ZHR may differ considerably.
C
the ZHR may differ considerably from the number of meteors an actual viewer observes in an hour.
D