noun
- a telescope designed to measure the angular diameter of the sun or the angular distance between celestial objects
Usage: astronomy
Examples
- The astronomer used a heliometer to measure the sun’s diameter.
- Early heliometers were crucial for determining stellar parallax.
- The observatory’s heliometer helped calculate distances to nearby stars.
- Scientists calibrated the heliometer before making solar observations.
- The heliometer’s precise measurements contributed to our understanding of stellar positions.