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Why are the day and night not equal on the equinox?

Asked by Strauss (23631points) October 26th, 2016

According to the sunrise/sunset calendar (as well as several other sources I’ve seen) the fall equinox occurred on September 22, 2016. However, the length of the day (6:47 AM to 6:57 PM) was longer than the length of night. The day and night did not have the same length until four days later (September 26), when the day lasted from 6:50 AM to 6:50 PM, exactly 12 hours. What is the reason for this seeming discrepancy?

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