1. of or relating to the heliometer, an astronomical instrument used to measure the angular distance between celestial objects or the diameter of the sun
Usage: technical; astronomy

Examples

• The heliometric observations provided precise measurements of stellar distances.
• Astronomers used heliometric techniques to determine the sun's diameter with greater accuracy.
• The heliometric method was instrumental in early parallax measurements.
• Heliometric instruments were essential tools in 19th-century observatories.