Orbit number
From Glossary of Meteorology
orbit number[edit | edit source]
A particular circular path beginning at the satellite's ascending node.
The orbit number from launch to the first ascending node is designated as zero.
The northbound equatorial crossing of a polar-orbiting satellite, given in degrees longitude, date, and coordinated universal time (UTC) for any given orbit or pass; the point at which a satellite crosses the equatorial plane, heading north.
