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Saturn travels around the Sun once every 29.45 Earth years, covering a path of 804,672,000,000 km (5,565,900,000 mi). Its mean distance from the Sun is 1,426,666,000 km (621,371,192 mi), and it moves at an average speed of 9 km/s (5.6 mi/s). The planet’s closest approach to Earth is about 1.2 billion km.
Saturn’s axial tilt of 27.7° causes pronounced seasons. When the north pole tilts toward the Sun, the northern hemisphere enjoys a lengthy summer that lasts over seven Earth years. Conversely, the southern hemisphere experiences winter during that same period. Each season ends when the pole tilts away, and the next equinox—when both hemispheres receive equal sunlight—occurs roughly every 15 Earth years.
Saturn’s iconic rings shine differently depending on which side faces the Sun. For half of its orbit, sunlight illuminates the southern face; for the other half, the northern side is lit. This alternation leads to temperature variations in the rings, a phenomenon NASA’s Cassini spacecraft studied for five years, measuring how the rings cool and warm as seasons change.
Because Saturn lacks a solid surface, scientists determine its spin period by tracking radio emissions tied to its magnetic field. Cassini’s 2004 observations indicated a rotation period of 10 h 45 m, while Voyager data from the early 1980s suggested a slightly longer 10 h 51 m. The discrepancy highlights ongoing debates about the planet’s magnetic dynamics and the true length of a Saturnian day.
