Weather Glossary - Y
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.
For many across New South Wales, July has been a cold month and for the younger generation, many won't be able to remember a month so cold.
A neighbour alerted council to a large embankment wall being built at a quarry years before it was blamed by some locals for contributing to the deadly 2011 Grantham flood, an inquiry has been told.
Melbourne is struggling through a July more typical of the mid 1900's.