保护地球，探索宇宙，发现文明
2023年8月26日 Crescents of Venus Image Credit & Copyright: Roberto Ortu Explanation: Just as the Moon goes through phases, Venus’ visible sunlit hemisphere waxes and wanes. This sequence of telescopic images illustrates the steady changes for Venus during its recent 2023 apparition as our evening star. Gliding along its interior orbit between Earth a...
2022年10月10日 A Double Lunar Analemma over Turkey Image Credit & Copyright: Betul Turksoy Explanation: An analemma is that figure-8 curve you get when you mark the position of the Sun at the same time each day for one year. But the trick to imaging an analemma of the Moon is to wait bit longer. On average the Moon returns to the same position in the sky a...
2020 May 21 Phases of Venus Image Credit & Copyright: Richard Addis Explanation: Just as the Moon goes through phases, Venus’ visible sunlit hemisphere waxes and wanes. This composite of backyard telescopic images illustrates the steady changes for Venus during its current stint as our evening star, as the inner planet grows larger but narrows to ...