On the night of Sunday, Sept. 21, the ringed planet Saturn officially returns to the evening sky, and all planet watchers will surely rejoice. On that night, Saturn reaches its opposition point, which readers of this column know means it will lie in the heavens opposite the sun, rising in the east-southeast at sunset and glistening all night long. Stargazers often cite Saturn as their favorite planet because of its glorious ring system that we can easily see with even a small, low-power telescope. That’s because as Saturn orbits the sun, it alternately displays to us different sides of the ring system. In fact, by the end of this year, they should become more obvious through a small telescope.