The maximum difference between mean time and apparent time is （）.<br>A:equal to the longitude expressed in time units<br>B:about 16 minutes<br>C:the difference between the GHA of mean sun and the first point of Aries<br>D:15°of arc

The maximum difference between mean time and apparent time is （）.
A:equal to the longitude expressed in time units
B:about 16 minutes
C:the difference between the GHA of mean sun and the first point of Aries
D:15°of arc

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