altitude correction of zenith difference

angle at zenith

angle of zenith

apparent zenith distance

atmosphere zenith delay

floating zenith telescope

geocentric zenith

geodetic zenith

gingival zenith

horizontal zenith telescope

improved tropospheric zenith delay model

large zenith angle shower

laser zenith meter

meridian zenith distance

photographic zenith tube

satellite zenith angle

Solar zenith angle

tracking of zenith pass

tropospheric zenith delay

tropospheric zenith path delay