軌 - rut, wheel, track

tire track

normal course (of action); proper course; regular way

orbit; trajectory

orbital eccentricity

geosynchronous orbit

trajectory-shifting (e.g. missile)

sun-synchronous orbit; heliosynchronous orbit; SSO

lawlessness; violation of customs

orbiter

course correction; trajectory change; orbital adjustment

continuous track; caterpillar track

orbital electron