Saturn to be Brightest Sunday, How to WatchSaturn, the second largest planet in our Solar System, will be at its brightest this Sunday i.e. Explained: Saturn at OppositionSaturn opposition is when it aligns with Earth and the Sun, with Earth in the middle. With Earth placed between Saturn and the Sun, Saturn's rings will be at their widest and brightest for the year, according to EarthSky. How to Watch Saturn in Opposition? Saturn also has the distinction of having a maximum number of Moons in the Solar System, and one of its Moon, Titan, is larger than Mercury.