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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Alert SA bushfire warning app not ready as fire bans implemented in central districts

12:13 EDT

An app designed to alert South Australians about bushfires is still not ready as total fire bans are issued for many districts today amid sweltering temperatures.

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10:27 EDT

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Tasmanian cattle farmers fear 'catastrophic' floods as farms inundated by too much water

09:22 EDT

Andrew Kay has an unusual complaint — his farm is too wet.