直接投影：我手中的月亮
(原标题: Direct Projection: The Moon in My Hands)
2022-02-28
浏览次数: 19
你不需要通过望远镜就能知道它指向哪里。允许望远镜将图像投射到一个大的表面上是有用的，因为它稀释了非常明亮的光源的强烈亮度。这种稀释对观测太阳很有用，比如在日食期间。然而，在这张特色的单次曝光照片中，投影出来的是一个太亮的满月。这个二月的满月发生在两周前，被一些北方文化称为雪月。这台突出的仪器是位于法国阿尔卑斯山脉高处的圣瓦萨兰天文台的62厘米主望远镜。直接看到满月更容易，因为它不会太亮，尽管你不会看到这种程度的细节。你的下一次机会将在3月17日。
查看原文解释
You don't have to look through a telescope to know where it's pointing. Allowing the telescope to project its image onto a large surface can be useful because it dilutes the intense brightness of very bright sources. Such dilution is useful for looking at the Sun, for example during a solar eclipse. In the featured single-exposure image, though, it is a too-bright full moon that is projected. This February full moon occurred two weeks ago and is called the Snow Moon by some northern cultures. The projecting instrument is the main 62-centimeter telescope at the Saint-Véran Observatory high in the French Alps. Seeing a full moon directly is easier because it is not too bright, although you won't see this level of detail. Your next chance will occur on March 17.
© Jeff Graphy