How the brain keeps track of time | Daniel Glaser

The body clock can easily become inaccurate. So how do our bodies synchronise our circadian rhythms?Why isn’t Easter the same date each year? Unlike Christmas, it relies on different religious calenders and astronomy tricks, in particular the Spring Equinox and the full moon, meaning it is complex to co-ordinate. The most we achieve are close matches: a lunar month is just over four weeks of earth days; a solar year is near to 12 lunar months. But if you make that rule absolute, things gra