noun
- plural of perihelion; the points in the orbits of celestial bodies where they are closest to the sun
Usage: astronomy
Examples
- The perihelia of comets often produce spectacular displays as they approach the sun.
- Scientists calculated the perihelia of several asteroids to predict their brightness.
- Mercury and Venus have perihelia that bring them very close to the sun.
- The spacecraft’s trajectory was planned to observe multiple perihelia during its mission.
- Astronomers study perihelia to understand orbital mechanics and solar heating effects.
- The perihelia of these objects occur at different times throughout the year.