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In the year 2000, the average length of a lunation was 29.530588 days (or 29 days, 12 hours, 44 minutes, and 3 seconds). However, the length of any one synodic month can vary from 29.26 to 29.80 days due to the perturbing effects of the Sun's gravity on the Moon's eccentric orbit.
The length of a lunation is linked to many phenomena in nature, such as the variation between spring and neap tides (the extreme highest and lowest tides, respectively).
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