1. relating to or measured from a point on the Earth’s surface
Usage: astronomy; geodesy

Examples

• The topocentric coordinates of the satellite were calculated from the observatory’s location.
• Astronomers use topocentric measurements to determine the exact position of celestial objects as seen from Earth.
• The topocentric parallax helps scientists calculate distances to nearby stars.
• GPS systems require topocentric corrections for precise positioning.
• The topocentric zenith angle varies depending on the observer’s location on Earth.
• Surveyors often work with topocentric reference frames for local mapping projects.