Time systems: Toe vs Toc

Toe

Toe is the time of ephemeris: the reference time for the orbit parameters.

In the API it is represented as: - week (system week number) - toe (seconds-of-week)

Toc

Toc is the clock data reference time: the reference time for the SV clock parameters (af0, af1, af2).

In the API it is represented as: - toc_week - toc (seconds-of-week)

Why both matter

• Orbit propagation uses Toe.
• Clock correction uses Toc.