Best Orbit for Monitoring Sea Surface Temperatures: Sun‑Synchronous (Heliosynchronous)

The optimal orbit for consistent, global sea‑surface temperature (SST) measurements is a Sun‑synchronous (heliosynchronous) orbit.

Why Sun‑Synchronous?

• Consistent Illumination: Satellite crosses each latitude at the same local solar time daily, minimizing diurnal temperature bias.
• Global Coverage: Near‑polar inclination (~98°) ensures the entire Earth is scanned regularly.
• Predictable Revisit: Fixed repeat cycle (e.g., daily, every few days) enables time‑series analysis.
• Data Continuity: Long‑term, homogeneous datasets for climate studies (NOAA AVHRR, ESA SLSTR, NASA MODIS).

Most operational SST satellites (NOAA POES, MetOp, Sentinel‑3, Suomi NPP) use this orbit to deliver accurate, comparable ocean temperature records.