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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Armidale Road set to operate with single lane for 12 months after Macleay Valley landslip

14:21 EDT

It will be at least a year before both lanes of Armidale Road in the Macleay Valley hinterland on the New South Wales Mid North Coast are open.

Cyclone watch issued for WA coastline

13:04 EDT

A severe tropical cyclone could hit the north coast of Western Australia later this week, with a cyclone watch issued for parts of the Pilbara and Kimberley.

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