欢迎来到近日点
(原标题: Welcome to Perihelion)
2025-01-04
浏览次数: 15
地球绕太阳运行的轨道不是圆形，而是椭圆形。这颗美丽的行星在其椭圆轨道上离太阳最近的点被称为近日点。今年的近日点是今天，1月4日，UTC时间13:28，就在这张活跃太阳的h - α照片拍摄前几个小时。在近日点，地球距离太阳约1.47亿公里。相比之下，在去年7月3日的远日点，地球距离太阳最远，约为1.52亿公里。但与太阳的距离并不能决定地球的季节。南方的夏天（北方的冬天）在12月至日开始，距离地球近日点不到14天，这只是巧合。地球的近日点日期恰好在美国宇航局帕克太阳探测器历史性近日点的11天内，这只是巧合。帕克太阳探测器于2018年发射，于2024年12月24日飞到距离太阳表面620万公里的地方，打破了它自己创造的离地球最近的航天器近日点记录。
查看原文解释
rth's orbit around the Sun is not a circle, it's an ellipse. The point along its elliptical orbit where our fair planet is closest to the Sun is called perihelion. This year perihelion is today, January 4, at 13:28 UTC, only a few hours before this H-alpha picture of the active Sun was taken. At perihelion the Earth was about 147 million kilometers from the Sun. For comparison, at aphelion on last July 3 Earth was at its farthest distance from the Sun, some 152 million kilometers away. But distance from the Sun doesn't determine Earth's seasons. It's only by coincidence that the beginning of southern summer (northern winter) on the December solstice is within 14 days of Earth's perihelion date. And it's only by coincidence that Earth's perihelion date is within 11 days of the historic perihelion of NASA's Parker Solar Probe. Launched in 2018, the Parker Solar Probe flew within 6.2 million kilometers of the Sun's surface on 2024 December 24, breaking its own record for closest perihelion for a spacecraft from planet Earth.
© Barden Ridge Observatory