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The average year length is 146,097/400 = 365 + 97 ⁄ 400 = 365.2425 days per year, a close approximation to the mean tropical year of 365.2422 days. [ 35 ] The Gregorian calendar is a reformed version of the Julian calendar organized by the Catholic Church and enacted in 1582.
The September equinox is one point in time commonly used to determine the length of the tropical year. The dates and times of the September equinoxes [ 8 ] that occur from the year 2018 to 2028 (UTC) are listed as follows:
The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds, using the modern definition [13] (= 365.242 19 d × 86 400 s). The length of the tropical year varies a bit over thousands of years because the rate of axial precession is not constant.
The inland deserts of Australia are amongst the hottest areas on earth, particularly the inland parts of north-west Australia. Every summer, intense heat builds starting in the Pilbara district of Western Australia around October/November and spreading widely over the tropical and subtropical inland parts of the continent by January. In the ...
An off-season Australian tropical cyclone is a tropical cyclone that existed in the Australian Region, between 90°E and 160°E, outside of the official season. The World Meteorological Organization currently defines the season as occurring between 1 November and 30 April, of the following year, which is when the majority of all tropical ...
As a result, the former has some of Australia's only tropical rainforest, while the latter features extensive temperate rainforests where floods can occur at any time. Through La Niña years the eastern seaboard of Australia (east of the Great Dividing Range) records above-average rainfall, usually creating damaging floods. The 2010–2011 La ...
One Callippic cycle corresponds to: 940 synodic months; 1,020.084 draconic months; 80.084 eclipse years (160 eclipse seasons); 1,007.410 anomalistic months; The 80 eclipse years means that if there is a solar eclipse (or lunar eclipse), then after one callippic cycle a New Moon (resp. Full Moon) will take place at the same node of the orbit of the Moon, and under these circumstances another ...
The length of 437=23×19 tropical years (about 159,610.837 days) is shorter than that of 23×235 synodic months (about 159,612.833 days) by almost exactly two days, up to only six minutes. The durations between the equinoxes (and solstices) are not equal, and will cycle around each other [ clarification needed ] over millennia.