![]() On the longest day of the year, the summer solstice, the day-to-day difference reaches zero.Īt the same time, locations farther from the equator experience larger day-to-day differences. After that, days still get longer, but at an ever-decreasing rate. In fact, the increase is greatest in the days surrounding the spring equinox. Meteorological and other seasons definitions Greatest Increase in Day LengthĪs spring starts, the length of day increases dramatically in most regions-except for the tropics, where day lengths do not change much during the course of a year. Also, some countries don't have fixed season dates but determine the start and end of spring based on average temperatures. In meteorology, the spring season begins on a different date. Sun rise/set and day length around this equinox.This corresponds to Saturday, 23 September 2023, 06:50 UTC. In Odesa, Odessa, Ukraine: Saturday, 23 September 2023, 09:50 EEST (Change location) Spring Equinox, Southern Hemisphere (September)Īustralia, New Zealand, South America, southern Africa Business Date to Date (exclude holidays).20) and the moment of the autumn equinox moves forward in time compared to the same moment in the year before. To adjust for the gradual movement backwards on the calendar (as visible for the period 1900 to 2099), in years divisible by 100 (1900, 2100, 2200, 23 on the graph), which should be leap years as they are divisible by 4, the leap day is omitted (except when they are divisible by 400, eg. This four year cycle is clearly visible in the graph. In this way the time of the autumn equinox constantly shifts back and forth so it always stays between September 21 and 24. In a non-leap year, the moment of the autumn equinox is about 5 hours 49 minutes after that moment in the previous year (in UTC), and in a leap year it is about 18 hours 11 minutes before that moment in the previous year, as can be seen in this graph. X axis (bottom, horizontal): Calendar years, Y axis (left, vertical): day in September (21 to 23). Graph demonstrating the movement (caused by leap shifting) of the exact moment of the autumn equinox between 19. The exact moment of the autumn equinox through the centuries At all other times the length of day and night will be different. ![]() On the day of an equinox, day and night are of approximately equal length all over the world, as the Earth's rotational axis is neither tilted away from nor towards the Sun. The word "equinox" is derived from Latin and means "equal night". The other days are the vernal equinox (beginning of spring), the summer solstice (beginning of summer) and the winter solstice (beginning of winter). ![]() The autumn equinox is one of four days with solar events (two equinoxes and two solstices) throughout the year that mark the beginning of a new season. To find out the exact date and time of the autumn equinox 2023 in your area use this seasons calculator. ![]() For locations that are ahead of UTC (further east) it may fall on the day after, and for locations that are behind UTC (further west) it may fall on the day before. While the autumn equinox occurs at the same moment in time all over the world, the date and local time differ from place to place depending on the year and a location's time zone. The dates given on this page are based on Coordinated Universal Time (UTC), which for practical purposes is equivalent to Greenwich Mean Time (GMT - the time zone of the United Kingdom). In the Northern Hemisphere the autumn equinox occurs every year between September 21 and 24. For the Southern Hemisphere, it is the vernal equinox (also called spring equinox) as it is the moment winter ends and spring begins. It is the moment summer ends and autumn ( fall) begins in the Northern Hemisphere (where nearly 90% of the world's population live). In the Northern Hemisphere, the moment in time when the Sun stands directly above the equator while crossing from the north to the south is called autumn equinox (also known as fall equinox, September equinox or southward equinox). The autumn equinox marks the beginning of autumn in the Northern Hemisphere ![]()
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