The summer solstice marks the end of spring and the beginning of summer in the hemisphere where it occurs and is one of four days (two equinoxes and two solstices) throughout the year on which a new season starts. To find out the exact date and time of the summer solstice 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 summer solstice 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 day of the summer solstice is the longest day of the year (the day with the most daylight and the shortest night) and occurs every year between June 20 and June 22. In the Northern Hemisphere, the summer solstice marks the beginning of summer.Ī summer solstice is the moment in time when the Earth's tilt towards the Sun is at its maximum and the Sun reaches its highest position in the sky.Ī summer solstice occurs twice a year, once in June in the Northern Hemisphere (also called northern solstice, June solstice and Midsummer) and once in December in the Southern Hemisphere (also called southern solstice and December solstice). ”Earths tilt and Seasons” - National Oceanic and Atmospheric Administration, over Stonehenge on the day of the summer solstice. More of these timing methods to determine summer can be found on .ġ. Some of these methods are dependent on the longest day measured, cultural festivals, temperatures and traditional calendar systems. ![]() Many countries around the world depending on their latitude will use different methods to determine the start of summer. Australia and New Zealand in the Southern Hemisphere use meteorological summer thus the months of December, January, and February to determine their summer season. Meteorological summer starts June 1st in the Northern Hemisphere and lasts 3 months (June, July, and August) with Autumn Season (September, October, and November) and Winter Season (December, January, and February) and finally Spring Season (March, April, and May). Meteorological Summer is determined by the annual temperature cycles and the Gregorian calendar. The United States, most of North America, Europe and many countries in the Northern Hemisphere use astronomical summer to determine when summer season officially starts and ends. The summer solstice occurs in the Northern Hemisphere between the dates of June 20 to 22 followed by the September equinox - September 21 to 23 and then the Winter solstice - December 20 to 23 and finally the March equinox - March 19 to 21. When the sun is over the equator you have the equinoxes and when the sun is over the Tropic of Cancer in the most northern position you have the summer solstice and conversely when the sun is over the most southern position over the Tropic of Capricorn you have the winter solstice. ![]() The tilt of the earth does not change as it goes around the sun so in the Northern Hemisphere the earth is tilted toward the sun in June and away from the sun in December. Seasons are caused by the tilt of the earth on its axis by 23.5 degrees. For countries located west of UTC your summer will start earlier than countries located east of UTC.Īstronomical Summer is determined by the changing positions of the earth relative to the sun giving us the solstices and equinoxes. This is referred to as astronomical summer or the summer solstice.Īstronomical summer starts at different times around the planet because of the different time zones as related to Coordinated Universal Time (UTC, same as Greenwich Mean Time based on the Royal Observatory in Greenwich, London ). The first day of summer (June solstice) is when the sun is in its most northern position directly over the Tropic of Cancer.
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