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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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Melbourne shivers through coldest July in 20 years, with wind chill adding to the pain

10:47 EST

A continuous series of cold fronts and brisk north-westerly winds have contributed to the coldest July in Melbourne in two decades, the Bureau of Meteorology says.

July wrap up around the grounds

16:19 EST

The month of July was quite dynamic across the nation, with some particularly strong cold fronts which delivered low level snow as far north as the Border Ranges, and spells of prolonged dry and warm conditions, particularly along the east coast.

Widespread rain to quench thirsty West Australian crops

16:02 EST

Widespread, drenching rain across many parts of Western Australia's agricultural region, brings a smile to the faces of local farmers.