x
uploads/gibbous.jpg

gibbous adj.1.凸面的;隆起的。2.駝背的。3.【天文學】凸...

gibbs

Changed of moon phases are brough about by the non - self - luminosity and the opacity of the moon . as the moon is a spherical body , sunlight can only illuminate half of the moon . viewing from different directions , the moon will appear to take the shapes of a circle , a semi - circle , a crescent , a gibbous or even completely invisible at all when its dark side faces the earth 由于月球本身不發光,只是反射太陽光,所以當月球運轉時,月球地球和太陽三者的相對位置便會不斷變化,因此,地球上的觀測者所見到月球被照亮的部分也在不斷變化,從而產生不同的月相

As it circles our planet , the changing position of the moon with respect to the sun causes our natural satellite to cycle through a series of phases : new , new crescent , first quarter , waxing gibbous , full , waning gibbous , last quarter , old crescent and back to new again 當月球進入地球的半影時,應該是半影食,但由于它的亮度減弱得很少,不易察覺,故不稱為月食,所以月食只有月全食和月偏食兩種。

The rise and sets of crescent and gibbous phase can be estimated in the same way . 蛾眉日和凸月的長落時刻,可以用同樣的方法估計。