The September Equinox

There are two points every year - September and March - When the sun hit the equator directly, the lengths of day and night are about the same.

Since the seasons on both sides of the equator are opposite, the spring equinance of September is also called Autumnal Equinox in the northern hemisphere, it is the first day of autumn.

In the Southern Hemisphere, the first day of spring will celebrate regardless of spring and spring day and night.

The spring equinox of September occurs at the moment when the sun crosses the equator of heaven (the imaginary line above the equator of the earth) from the north to the south. This occurs on September 22, 23, or 24 every year.

The axis of the earth is tilted at an angle of about 23.4 ° with respect to the ecliptic. The ecliptic is a virtual plane created by the locus of the earth turning around the sun.

On the other day, the Southern Hemisphere or the Northern Hemisphere is a bit inclined towards the sun. However, at the two points, the slope of the earth's axis is perpendicular to the sun's rays, as shown in the figure.

At the minute point, the night and day are almost the same - 12 hours - the same in the world. This is why it is called "evening" which means "weekday" in Latin. However, even if it is widely accepted, it is not entirely correct. Actually, there is no daylight of 12 hours exactly at this point.

In the Northern Hemisphere, spring equinox will come to the beginning of fall (Autumn). Many cultures and religions celebrate festivals and festivals surrounding the spring equinox.

The famous ancient night celebration is Maya's ritual of the main pyramid of Chichen Itza, Mexico. The pyramid is called El Castillo and has four stairs from the top to the bottom of the pyramid. Therefore it is famous for the bloody human beings sacrifice. The stairs were built with a carefully calculated angle, which looked like a huge sunny snake that slid down the stairs in the day and night.

The eccentricity of the Earth's orbit is about 186 days from the vernal equinox of March to the vernal equinox of September, but the time from the vernal equinox of September to the vernal equinox of March is not about 179 days. The diameter cuts the orbit equally, but through the plane parallel to the equator of the earth it cuts the orbit into two parts with an area ratio of 186 to 179, so the eccentricity of the earth 's orbit is about that. It took nearly two centuries to begin developing Kepler's work to adopt the form of reconciliation. Voltaire's Newton philosophical element (Newton's philosophical element) in 1738 was the first publication using the term "law". An encyclopedia of astronomers biography is Kepler 's article (p. 620) and points out that the scientific terms of these discoveries have started at least from the time of Joseph de la Lande.

By definition, the first point (flag) of Libra always matches the sun of 1 / 9th of the position. The spring sun of September came before Virgo, but it is not so. From 23rd September or 23rd September the sun fell over the sign of the Libra for one month, but during this time the sun shines in front of Virgo. As constellations are not as abstract as logos, astronomers and starry sky observers who directly observe the night sky find it easier to see constellations. Listing StarCraft Spica as Libra 23o 50 'is not right, but this information does not help many people find the brightest constellation of Spica, Virgo.

The vernal equinox occurs normally on September 22 or 23, but rarely happens on September 21 or September 24. The point on September 26, 1991 did not occur for thousands of years. However, in the 21st century, it will happen twice in 2092 and 2096. The vernal equinox of September 24 last year occurred in 1931, the next occurs in 2303. Places not on the equator receive the same day and night twice a year, usually several days before or after the day. The date of this event, also called equilux, depends on the latitude of the place - a person near the equator will celebrate it in the few days before the spring