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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Grower lathers crops in molasses to protect produce as South Australia endures consecutive frosts

12:35 EST

As South Australian temperatures plummet below zero severely damaging crops, some growers are turning to creative methods to protect their produce.

SpaceX rocket to carry Australian satellites that will improve nation's weather forecasting

12:03 EST

Australian satellites that will improve the nation's weather forecasting will shoot into space on the world's most powerful operational rocket today, with the help of a small team of experts in the Northern Territory.

Dry air chill in Tasmania and the Top End

11:54 EST

Darwin and Hobart both registered their lowest temperature in more than five years on Tuesday morning.