Saturn is the planet of limitations and lessons. Because he is associated with restriction, Saturn's transits and aspects are sometimes dreaded. The truth, though, is that Saturn isn't about punishment, he's about karma -- if you put in the work where Saturn says you need to (as dictated by his location in your Astrology birth chart), you are rewarded; yet if you neglect to listen to Saturn's lessons, you might not like the consequences.
Saturn's biggest spotlight-moment in Astrology comes at a person's Saturn Return. The Saturn Return happens when Saturn returns to the exact point in the sky where it was when that person was born, which happens every 28 - 30 years. Think of the Return as Saturn's version of Judgment Day, the time when he decides if you've made progress or not, and either doles out rewards, or consequences that will help move a person closer to learning the lessons that have been missed so far.
Nickname: The Taskmaster
Zodiac sign Saturn rules: Capricorn
Exalted in: Libra
House Saturn rules: 10th House of Career, Authority and Publicity
Saturn stays in each zodiac sign for: 2 1/2 years
Saturn makes a complete trip through the zodiac: once every 28 - 29 years
Saturn retrogrades: about once every year, with each retrograde lasting around four or five months
In Roman mythology, Saturn was a god that ruled over time and justice. Before the discovery of Uranus, Neptune, and Pluto (that came after the invention of the telescope), Saturn was the last visible planet in our solar system, giving it its association with limits and boundaries.