2021年的满月
The Full Moon of 2021
Image Credit & Copyright: Soumyadeep Mukherjee
Explanation: Every Full Moon of 2021 shines in this year-spanning astrophoto project, a composite portrait of the familiar lunar nearside at each brightest lunar phase. Arranged by moonth, the year progresses in stripes beginning at the top. Taken with the same camera and lens the stripes are from Full Moon images all combined at the same pixel scale. The stripes still looked mismatched, but they show that the Full Moon’s angular size changes throughout the year depending on its distance from Kolkata, India, planet Earth. The calendar month, a full moon name, distance in kilometers, and angular size is indicated for each stripe. Angular size is given in minutes of arc corresponding to 1/60th of a degree. The largest Full Moon is near a perigee or closest approach in May. The smallest is near an apogee, the most distant Full Moon in December. Of course the full moons of May and November also slid into Earth’s shadow during 2021’s two lunar eclipses.
Tomorrow’s picture: bright moon halos
2021年的满月
影像提供与版权: Soumyadeep Mukherjee
说明: 这个横跨2021年的天文摄影工作，组合出我们很熟悉的月球正面在盈满月相时的风采；在影像里，整年的满月都在绽放光芒。这些依月份排列的月条横幅，从顶端向下的依月份递增。这些从同一部相机和镜头拍摄的满月影像所取出的月条，叠合时使用相同的相素比例。这些月条虽然看来颇有参差，但它们见证满月的张角，其实和它们与拍摄点地球·印度·加尔各答的距离有关。每个月的月条之旁，标注了满月的名称、距离（公里）、及张角。张角的单位为角分，相当于1度的60分之1。2021年的最大张角满月，出现在五月，当时满月在近地点附近。而张角最小、位在远地点附近的满月，则出现在十二月。五月和十一月的满月更滑入地球的暗影里，为我们带来2021年的2次月食。
明日的图片: bright moon halos
