Fairfax Media Network

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

No Perth rain in April for first time since 1982

14:11 EST

No rain fell in Perth at all during the month of April for only the fourth time in the past 140 years, according to the Bureau of Meteorology.

Will we have a good snow season this year?

10:45 EST

There were two decent rounds of alpine snow last month and much of Australia's southeast shivered through their coldest temperatures in at least six months last week.

Colder showery change moving through southern states

16:08 EST

A front is bringing a colder showery change to southern Australia, dropping temperatures by five-to-10 degrees.