Data and algorithms
历元
Epoch
The reference time for coordinates or elements.
J2000.0 is noon on 1 January 2000.
Related terms
- Right ascension — The celestial equivalent of longitude, in hours.
- Ground station — A facility talking to satellites.
- S-band — The 2–4 GHz band, common for tracking and control.
- X-band — The 8–12 GHz band, used for high-rate data.