Nodal Precession & Sun-Synchronous Orbits

Earth's equatorial bulge means real satellites never trace a perfectly fixed ellipse in space — the whole orbital plane slowly swivels around the planet's axis, an effect called J2 nodal precession. This simulator computes that precession rate from the actual perturbation formula for a satellite you configure by altitude, eccentricity and inclination, propagates the satellite itself along its ellipse with real two-body angular-momentum conservation, and renders both the fast orbital motion and the (heavily time-accelerated) drift of the ascending node in 3D. A one-click solver finds the inclination that turns any altitude/eccentricity pair into a true sun-synchronous orbit — the mechanism that keeps polar weather and reconnaissance satellites crossing the equator at the same local solar time on every single pass.