from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative form of parhelion.
from the GNU version of the Collaborative International Dictionary of English
- n. See parhelion.
from The Century Dictionary and Cyclopedia
- n. Same as parhelion.
- n. A name given by Runge and Paschen to a supposed distinct gas which, on the ground of certain spectroscopic observations, they believed to be present in helium. It has since been shown that the helium examined is but a single substance, the spectroscopic differences being due to change of pressure.
Sorry, no etymologies found.
The principle of correspondence states that the two electrons in parhelium in their tracks of rest run along two circles, which form an angle of 60° to one another.
According to the principle of correspondence, the tracks of the two innermost electrons lie in the same way as the tracks of the two electrons in parhelium, while the track of the third is elliptical and is of far greater dimensions than the inner tracks.
It occurs in two different modifications: one is called parhelium, and is the more stable, and the other is called orthohelium - these were supposed at first to be two different substances.