标签： perihelion

天文·每日一图

2023年近日点的太阳

2023年1月14日 Perihelion Sun 2023 Image Credit & Copyright: Peter Ward (Barden Ridge Observatory) Explanation: Perihelion for 2023, Earth’s closest approach to the Sun, was on January 4 at 16:17 UTC. That was less than 24 hours after this sharp image of the Sun’s disk was recorded with telescope and H-alpha filter from Sydney, Australia, planet...

天文·每日一图

近日点与远日点

2021年7月8日 Perihelion to Aphelion Image Credit & Copyright: Richard Jaworski Explanation: Aphelion for 2021 occurred on July 5th. That’s the point in Earth’s elliptical orbit when it is farthest from the Sun. Of course, the distance from the Sun doesn’t determine the seasons. Those are governed by the tilt of Earth’s axis of rotat...