The week of September 4-10 takes us from the end of Day 13 through Day 19. This week we will highlight the crater Riccioli, visible on Monday night, and discuss libration. Riccioli: [NW/K2] Because this crater is close to the
#MoonCrater Riccioli and Phenomenon Called Libration
![#MoonCrater Riccioli and Phenomenon Called Libration #MoonCrater Riccioli and Phenomenon Called Libration](http://andrewplanck.com/wp-content/uploads/2017/09/MoonCrater-Riccioli-and-Phenomenon-Called-Libration-750x350.jpg)