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Equinox definition geography12/17/2023 ![]() ![]() On Earth, there are two equinoxes every year: one around March 21 and another around September 22. The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. (Equinox means equal night, since day and night are equal at 12 hours each. Article Vocabulary An equinox is an event in which a planet ’s subsolar point passes through its Equator. English borrowed the name in the 14th century, when it was first used in an astronomical treatise written by Geoffrey Chaucer. DI Librarys guide to books, websites, and other. It goes without saying that stargazing is a lot easier to do at night than during the day, and given the importance of the stars in Roman life, it's not surprising that they chose to highlight the night in naming the equinox. ![]() But he told me he was going by way of Sicily" (Cicero, Atticus 12.28.3 translation by E. Julius Caesar notes in his firsthand account of the Gallic Wars that he took the equinox into consideration when planning sea forays into Gaul, and Cicero writes, "If Publius is waiting for the equinox, as you say Aledius tells you, then he must be going by sea. These measurements were vital for accurate navigation and helping chart things like weather, and we see that in the Latin uses of aequinoctium. Autumn equinox designates the time when the sun appears to move from north to south across the. The Autumnal Equinox is an astronomical event that takes place twice a year, on March 20 in the Southern Hemisphere and around September 22 in the Northern Hemisphere. They needed a "zero point" from which they could measure the movement of the stars, and they chose the vernal equinox as that starting point. Autumnal Equinox is often referred to as the September equinox or the fall equinox. Without knowing about the tilt of the earth, or its orbit in relation to the sun and other planets, they attempted to make sense of what they saw, and how they did that was to track the movement of the constellations in comparison with the sun and the moon. Definition of mini-sub in the dictionary. An equinox occurs when the sun is closest to the equator while solstice takes place at a time when the sun is at the furthest point from the equator. There are other sub-branches of geography such as political geography, historical geography. You only see half of that sphere at once, and if you've ever been to a planetarium, this is a good approximation of what the celestial sphere looks like from earth: a concave half-dome with us at the center.Īstronomers in the ancient world knew that the position and movement of the stars and constellations on the celestial sphere changed throughout one solar year. The first and the biggest difference is with regards to the distance of the sun from the equator. ![]() (Ever hear people complain that everything's going wrong because Mercury is in retrograde?) Ancient astronomers came up with the idea of the celestial sphere, or a giant sphere that the earth sits within and on whose surface all the stars are found. The vernal equinox is considered the first day of spring: finally, the day and night are of equal length.īut why does equinox refer to night? After all, the thing we miss the most in deep December is the daylight, not the night.įor most of Western history, the position and movement of the sun and stars at particular points during the year were used for everything from navigation to causality. ![]()
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