2020年9月26日

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Moon Pairs and the Synodic Month
Image Credit & Copyright:
Marcella Giulia Pace

Explanation: Observe the Moon each night and its visible sunlit portion will gradually change. In phases progressing from New Moon to Full Moon to New Moon again, a lunar cycle or synodic month is completed in about 29.5 days. They look full, but top left to bottom right these panels do show the range of lunar phases for a complete synodic month during August 2019 from Ragusa, Sicily, Italy, planet Earth. For this lunar cycle project the panels organize images of the lunar phases in pairs. Each individual image is paired with another image separated by about 15 days, or approximately half a synodic month. As a result the opposite sunlit portions complete the lunar disk and the shadow line at the boundary of lunar night and day, the terminator, steadily marches across the Moon’s familiar nearside. For extra credit, what lunar phase would you pair with the Moon tonight?

Tomorrow’s picture: cloudy skies


配对的月亮月相周期
影像提供与版权:
Marcella Giulia Pace

说明: 如果你每晚观测月亮,就会发现它的日曜区逐日有变化。它的位相从新月逐渐变成满月,然后再回到新月,整个月相周期(朔望月、太阴月)为期29.5天。上图里的月亮虽然乍看全是满相,不过这些从左上到右下排列的图板,呈现在2019年8月从义利.西西里.拉古萨看出去,一整个朔望月里的月相变化。这幅记录月亮周期的影像,每一张图板,都是由约相隔15天(约半个月相周期)拍摄的互补月相组成。因此,每张图板的月亮之日曜区互补,嵌成完整的月盘,相接处的暗线,则是分隔月亮白画面和夜面、逐渐移过熟悉的月亮正面之明暗分界线。最后来个加分题:与今晚月亮配对的月亮之月相为何?

明日的图片: cloudy skies

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