Weather Glossary - Y

Search

Year

The interval required for the earth to complete one revolution around the sun. A sidereal year, which is the time it takes for the earth to make one absolute revolution around the sun, is 365 days, 6 hours, 9 minutes and 9.5 seconds. The calendar year begins at 12 o'clock midnight local time on the night of December 31st-January 1st. Currently, the Gregorian calendar of 365 days is used, with 366 days every four years, a leap year. The tropical year, also called the mean solar year, is dependent on the seasons. It is the interval between two consecutive returns of the sun to the vernal equinox. In 1900, that took 365 days, 5 hours, 48 minutes, and 46 seconds, and it is decreasing at the rate of 0.53 second per century. This decrease is due to the slow precession of the Earth's axis of rotation.

Display Your Local Weather

Weather News

Wet weather looms for southern and eastern Australia

12:06 EST

Widespread showers and some thunderstorms and snow will affect a broad area of southern and eastern Australia at the end of this week.

Victorian ski resorts restrict Melbourne holidaymakers amid coronavirus outbreak

18:42 EST

Victoria's alpine ski resorts have officially barred visitors from Melbourne coronavirus hotspots, as cases in the state's capital soar.