2025年4月22日
Terminator Moon: A Moonscape of Shadows
Image Credit & Copyright: Rich Addis
Explanation: What’s different about this Moon? It’s the terminators. In the featured image, you can’t directly see any terminator — the line that divides the light of day from the dark of night. That’s because the featured image is a digital composite of many near-terminator lunar strips over a full Moon. Terminator regions show the longest and most prominent shadows — shadows which, by their contrast and length, allow a flat photograph to appear three-dimensional. The overlay images were taken over two weeks in early April. Many of the Moon’s craters stand out because of the shadows they all cast to the right. The image shows in graphic detail that the darker regions known as maria are not just darker than the rest of the Moon — they are also flatter.
Dial-A-Moon: Find the Moon phase on your birthday this year
Tomorrow’s picture: almost everything
明暗交界线附近的月面
影像提供及版权: Rich Addis
说明: 这张月亮影像有何特殊之处？关键在于明暗交界线。不过在这幅主题影像里，分隔月面白昼区与黑夜区的明暗交界线从未出现。因为它是一幅数位合成影像，拼接了多张撷取自月面照片明暗交界线附近的长条。缘由是明暗交界线附近区域里的影子，最长也最明显，这些阴影造成强烈的对比，让这幅月面照片带着立体感。组成这幅影像的照片，皆是摄于四月的头二星期里。影像里的众多撞击坑之所以如此鲜明，是因为它们投射的影子都落在右侧。除此之外，这幅影像也生动的证实：名为月海的暗区不仅颜色较深，它们也较月球的其他区域平坦。
拨打月亮: 查找你今年生日当天的月相
明日的图片: almost everything
