noun, plural per·i·he·li·a [per-uh-hee-lee-uh, -heel-yuh] /ˌpɛr əˈhi li ə, -ˈhil yə/. Astronomy.
- peril point
Origin of perihelion
Examples from the Web for perihelia
It is a remarkable fact, however, that the longitudes of their perihelia differ by almost exactly 180.
The extremes of temperature at perihelia and aphelia to which comets are subjected did not bother him particularly.Astronomy|David Todd
The maximum occurs between 30 and 60, where thirty-five perihelia are found in 30 of longitude.
At the second, Encke's comet and all others with perihelia within Mercury's orbit would have shared a similar fate.
This tendency of the perihelia to crowd together in two opposite regions has been noticed by different writers.Comets and Meteors|Daniel Kirkwood
noun plural -lia (-lɪə)
Word Origin for perihelion
"point at which a celestial body is nearest the Sun," 1680s, coined in Modern Latin (perihelium) by Kepler (1596) from Latinizations of Greek peri "near" (see peri-) + helios "sun" (see sol). Subsequently re-Greeked.