What does azimuth mean?
An azimuth is the horizontal angle that specifies a direction around the compass, measured in degrees clockwise from a reference point — usually true north. In astronomy it fixes where a star or planet sits along the horizon, working alongside altitude, which gives the vertical angle above it. Surveyors use azimuths to establish property lines and map features; navigators and artillery crews rely on them to set headings; engineers align antennas and solar panels by their azimuth angles. The term carries a precise, technical connotation and appears mainly in scientific, military, and engineering writing rather than everyday speech. Because it reduces any direction on the horizontal plane to a single number between 0 and 360 degrees, azimuth offers an unambiguous way to communicate orientation, which is why it remains fundamental to fields that demand exact positioning.
The horizontal angular distance of a point or celestial body, measured clockwise in degrees from true (or sometimes magnetic) north.
"Navigators plotted the ship's course using the azimuth of the morning star."
Often given together with altitude or elevation, which supplies the vertical component of the same observation.
In engineering and gunnery, the horizontal angle setting used to aim or orient an instrument, weapon, or antenna.
"The technician adjusted the radar's azimuth before sweeping the sector."
Commonly paired with 'elevation' when describing full two-axis aiming systems.
Regular plural; typically used when listing multiple bearings or observations in technical tables and reports.
"The survey table listed azimuths for each of the twelve reference points."
Astronomers borrowed 'azimuth' from medieval Arabic — making it a linguistic cousin of the very word for 'the point overhead': zenith.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of azimuth
Azimuth entered English in the late Middle Ages via scientific Latin and Old Spanish texts, ultimately deriving from the Arabic plural form 'al-sumūt', meaning 'the directions' or 'the ways'. It shares this Arabic astronomical heritage with the closely related words zenith (from 'al-samt', 'the path overhead') and nadir. The word spread through European astronomy during the Renaissance, when Arabic star tables and instruments were translated into Latin, cementing its place in technical vocabulary across Europe.
Related word forms
How azimuth is actually used
Azimuth belongs chiefly to technical registers — astronomy, navigation, surveying, ballistics, and satellite engineering — and is rare in casual conversation. Angles are conventionally measured in degrees clockwise from north, though some contexts specify magnetic rather than true azimuth; stating which reference is intended avoids ambiguity. The word pairs naturally with elevation or altitude, which supply the vertical component of a position.
Easily confused with azimuth
Altitude measures a celestial object's vertical angle above the horizon, while azimuth measures its horizontal angle around from north.
Elevation is the vertical angle of a target above the horizontal plane, whereas azimuth is the horizontal rotation needed to face it.