[/caption] Moonshadows on Saturn’s rings are foretelling the planet’s equinox, when the sun will be exactly aligned with the planet’s equator and rings — and then will shift north from the southern hemisphere, kickstarting northern spring.  NASA’s Cassini spacecraft has captured, for the first time, the tell-tale moonshadows  – sort of like groundhogs on Earth.   … Continue reading Moonshadows on Saturn’s Rings Are Harbingers of Spring