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By 'actual sunrise,' the chapter specifically means

Question
By 'actual sunrise,' the chapter specifically means
the moment we first see any light from the Sun
the actual crossing of the horizon by the Sun
exactly 6 AM local time
the time recorded by a sundial only
Answer
the actual crossing of the horizon by the Sun
Detailed Explanation
The chapter explicitly defines actual sunrise as the actual crossing of the horizon by the Sun, distinct from when it becomes visible to us.
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