月亮派和山影
(原标题: Moon Pi and Mountain Shadow)
2024-03-14
浏览次数: 24
月球与太阳之间的相位是3.14弧度？当然是满月了。尽管月亮可能会在几天内看起来很圆，但当月亮在黄道经度上与太阳的距离是圆弧度（也就是180度）时，它才是真正的满月。它在地球的天空中与太阳相对。2020年3月9日，当太阳落山时，在满月的那一刻仅仅一个小时左右，这个橙色的、略扁的月亮看起来仍然很圆。这张照片是在特内里费群岛加那利岛上的泰德国家公园拍摄的，正对着夕阳。从海拔约3500米的泰德火山山顶附近看，日落的对面是这座山上升的三角形阴影，延伸到地球稠密的大气中。在远处山脊线的下方，左边是泰德天文台的白色望远镜圆顶。3月25日，满月在经过地球外阴影的半影月食时，又会在距离太阳Pi弧度的地方稍微变暗。
查看原文解释
What phase of the Moon is 3.14 radians from the Sun? The Full Moon, of course. Even though the Moon might look full for several days, the Moon is truly at its full phase when it is Pi radians (aka 180 degrees) from the Sun in ecliptic longitude. That's opposite the Sun in planet Earth's sky. Rising as the Sun set on March 9, 2020, only an hour or so after the moment of its full phase, this orange tinted and slightly flattened Moon still looked full. It was photographed opposite the setting Sun from Teide National Park on the Canary Island of Tenerife. Also opposite the setting Sun, seen from near the Teide volcano peak about 3,500 meters above sea level, is the mountain's rising triangular shadow extending into Earth's dense atmosphere. Below the distant ridge line on the left are the white telescope domes of Teide Observatory. Again Pi radians from the Sun, on March 25 the Full Moon will dim slightly as it glides through Earth's outer shadow in a penumbral lunar eclipse.
© El Cielo de Canarias