What Is a Perihelion?

Each star's orbit around the sun is roughly an ellipse, and its long and short diameters are not much different, and can be approximated as perfect circles. The sun is at a focal point of the ellipse, and the focal point is not at the center of the ellipse. Therefore, the distance between the star and the sun is sometimes closer, sometimes further. When it is closest to the sun, this point is called the perihelion.

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Swift-Tuttle

Perseid meteor shower

At 13:15 on March 5, 2002, astronomers Zhang Daqing and Japanese amateur astronomer Chi Guxun jointly discovered the "Ichigu-Zhang Comet" at the beginning of last month. Astronomers have calculated their orbits. It will pass the perihelion on March 18th, which will be many days in the country

Perihelion and distant point solar radiation

Lovers of text provide a good opportunity to observe the new comet. According to reports, "Ikeda-Zhang Comet" has gradually approached the perihelion. After that, for more than ten days, the comet will appear in the southwestern sky. The comet will appear in the southwestern sky. Telescope observation. Especially from the days of March 15-20, the brightness of this comet will continue to increase, and its brightness is estimated to be about 4 stars. It can be seen with the naked eye in the suburbs without light interference and high atmospheric tranquility. To a blurry bright spot like dandelion, namely "Ikeda-Comet Zhang"