Saturn’s moon Iapetus reaches greatest western elongation today, now located 9.5’ west of the ringed planet. Iapetus has two vastly different hemispheres, one light and one dark. As the moon orbits Saturn, it slowly rotates so that one and then the other side faces us, with its brightness varying vastly depending on which region is Continue reading "The Sky Today on Saturday, August 30: Iapetus reaches western elongation" The post The Sky Today on Saturday, August 30: Iapetus reaches western elongation appeared first on Astronomy Magazine .