春分 英文介绍

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The Spring Equinox, also known as the Vernal Equinox, is an astronomical event that marks the moment when the Earth's axis is neither tilted towards nor away from the Sun. This event occurs around March 20 or 21 each year, depending on the year and the time zone.

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During the Spring Equinox, day and night are approximately equal in length, and it is considered the beginning of spring in the Northern Hemisphere and autumn in the Southern Hemisphere. Here's a more detailed introduction to the Spring Equinox:

**Definition:**

The Spring Equinox is one of two times in the year when the Sun crosses the celestial equator, an imaginary line in the sky where the Earth's equator meets the sky. The other time is the Autumn Equinox, which occurs around September 22 or 23.

**Celestial Events:**

On the day of the Spring Equinox, the Sun rises due east and sets due west, and the celestial equator is perpendicular to the Sun's rays at noon. This means that the Sun's position in the sky is directly over the Earth's equator at this time.

**Duration of Day and Night:**

During the Spring Equinox, the length of day and night is roughly equal all over the world, with the exact length depending on the latitude of the observer's location. This is because the Sun is traveling across the sky at its highest angle at this time of year, leading to equal periods of daylight and darkness.

**Cultural Significance:**

The Spring Equinox has been celebrated in various cultures around the world for centuries. In many places, it marks the beginning of the planting season and the renewal of life. The Chinese celebrate it with the Qixi Festival, a romantic festival that symbolizes the union of two lovers separated by the Milky Way.

**Astronomical Observations:**

Astronomers use the Spring Equinox as a reference point to measure the Earth's position in its orbit around the Sun. It is also a time for astronomical observations, such as tracking the position of celestial bodies and determining the length of a day.

The Spring Equinox is a significant event that brings balance to the Earth's seasons and is celebrated in many different ways across the globe.

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