Northward equinox solar year March equinox
the march equinox 1 point in time commonly used determine length of tropical year. mean tropical year average of tropical years measured every point along earth s orbit. when tropical year measurements several successive years compared, many slight variations found due variety of phenomena, including nutation , planetary perturbations sun. following table shows small variations in timing on long period of time; mean tropical year lasts 365 days, 5 hours, 48 minutes, 45 seconds.
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