Fr.: parallèle géodésique
1) Said of two or more things, such as lines or planes, that are equally
distant from one another at all points.
Parâsu, from parâ-, → para-, + su "direction, side," from Mid.Pers. sôk "direction, side."
parallel axis theorem
farbin-e âsehâ-ye parâsu
Fr.: théorème des axes parallèles
The → moment of inertia of a body about any given axis is the moment of inertia about a parallel axis through the center of mass, plus the moment of inertia about the given axis if the mass were located at the center of mass. same as → Steiner's theorem.
parallel of altitude
A small circle on the celestial sphere whose plane is parallel to the celestial horizon. Same as → almucantar.
A solid figure whose six bases are → parallelograms, opposite pairs being identical and parallel.
havâsepehr-e parâsu-taxthâ, javv-e ~
Fr.: atmosphère plan-parallèle
An approximation used in many stellar atmosphere models that depict the atmosphere as being only one-dimensional and bounded at the top and bottom by horizontal plane surfaces normal to the direction of gravity.
Fr.: lame plan-parallèle
A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture.