Weather Glossary - Y
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YearThe 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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Weather News
Widespread Lightning for NSW
11:32 EDT
Over 600,000 lightning strikes were recorded yesterday as storms sparked up across NSW.
Hot Christmas weather, fire risk ahead for Victoria, authorities say
10:55 EDT
Hot and windy conditions forecast for Victoria in the coming days will create a serious risk of grass and bushfires, the state's Emergency Management Commissioner Craig Lapsley says.
Christmas Eve fog not a Bridgewater Jerry in reverse, weather bureau says
09:34 EDT
A Christmas Eve fog which blanketed the greater Hobart area has been interpreted incorrectly as a reversal of the famous Bridgewater Jerry, the Bureau of Meteorology says.
