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Q: Why, sometimes, are sunrise and sunset times different from year to year?
A: Sunrise and sunset times can vary up to a minute for the same date from year to year. According to the Gregorian Calendar a year is 365.2425 days. If almost every fourth year is a leap year (366 days in 2008) the first three years fall short of being a complete year. Therefore, the Earth's position from year to year is not exact.
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