небесний екватор
magnetic equator / aclinic line / dip equator
equator
astronomic(al) equator
solar equator
terrestrial equator
celestial body
celestial and satellite navigation systems
celestial coordinate system
celestial horizon
celestial meridian
celestial monitoring
celestial navigation system
celestial sphere
celestial time
celestial navigation
atmosphere-bearing celestial body
celestial forces
celestial guidance
celestial navigation instrument
celestial position finding
celestial reference
celestial-inertial guidance