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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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A stormy outlook for Darwin

13:23 EDT

Darwin is on track to reach their December average rainfall, which is already sitting at the halfway mark.

Unsettled spell for Perth

12:23 EDT

The England cricket team may feel more at home, as conditions turn wet and very windy for the end of the third test.

'Simple' calculations predicted floodwaters in 2011, residents near Wivenhoe Dam say

09:20 EDT

Two days before floodwaters threatened the Ipswich region, west of Brisbane, in January 2011, Darren and Brad Zanow knew they had to move their belongings to higher ground.