A sun-synchronous orbit (SSO) is engineered so the orbital plane rotates at exactly the same rate as Earth orbits the Sun — maintaining a constant solar illumination angle on every pass.
A sun-synchronous orbit (SSO) is engineered so the orbital plane rotates at exactly the same rate as Earth orbits the Sun — maintaining a constant solar illumination angle on every pass.
Achieving sun-synchronous precession requires a specific combination of altitude and inclination — the relationship follows a precise formula.
Landsat, Sentinel-2, WorldView, Planet Labs, MODIS, and almost every Earth observation constellation uses SSO. The 10:30 AM local time provides ideal sun angle for optical imaging — low shadows, full illumination.
For any mission where consistent, comparable imagery matters — SSO is almost always the answer.
You've completed the Ground Tracks module. You now understand how tracks form, what inclination controls, how Earth rotation shifts passes, how revisit and coverage work, and why SSO is the workhorse of Earth observation.