Weather Glossary - Y

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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.

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NSW coast to be lashed by rain over next seven days due to low-pressure system

19:04 EDT

The east coast of NSW will continue to be lashed by consistent rain for the next seven days, with the Bureau of Meteorology (BOM) warning there could be flash flooding in parts.

Wild storms lash south-east Queensland, leaving thousands without power

19:00 EDT

A person has been struck by a tree during wild storms which have brought destructive winds, lightning and heavy rain to south-east Queensland.