How Does NASA "Predict" Eclipses? Using the Saros Cycle. 18 years, 11 days, and 8 hours. The Saros Cycle has been used for over 5000 years, since ancient Babylonian times. They dont use heliocentric math. Heliocentrism doesnt predict a damn thing. It cant. @TheParanormiesPresent @AltSkull48 16.5K viewsAlt Skull️, edited 16:52