Today

What is coming round again

An almanac of things that return: the Moon, the long and short days, the solstices and equinoxes, and a feast that moves because it is tied to both the Moon and the equinox. Each page shows its arithmetic, and each figure is worked out afresh whenever the page is opened.

Times are in your device’s time zone. Daylight is for the latitude chosen on the daylight page, which your browser remembers.

Contents

• i.The Moon

  A month of 29.53 days, why it is longer than one orbit, and the nineteen-year cycle in which the phases fall on the same dates again.

• ii.Daylight

  How long the Sun is up, anywhere from the equator to the poles, through a whole year.

• iii.Easter

  The fourteen small sums that set a moving feast, and the 5,700,000 years it takes to repeat.