- Отрасли: Aerospace
- Number of terms: 16933
- Number of blossaries: 2
- Company Profile:
The Executive Branch agency of the United States government, responsible for the nation's civilian space program and aeronautics and aerospace research.
Two bodies are in quadrature when their difference in celestial longitude is 90 degrees. This is the position of a superior planet when its elongation is 90 degrees, east or west, depending on the direction of the planet from the sun.
Industry:Astronomy
(1) a sun with respect to its planets, or a planet with respect to its satellites; (2) the brighter member of a double star system.
Industry:Astronomy
The hiding of one heavenly body by another, as when the moon passes between earth and a star, or when one of the moons of jupiter or saturn passes behind the planet.
Industry:Astronomy
The point on the celestial sphere that is diametrically opposite the zenith, so that the zenith, nadir and center of earth are in one straight line. It is always 90 degrees below the horizon.
Industry:Astronomy
The amount of matter in a body, which should not be confused with weight. The same object will have different weights in space and earth but the mass remains constant.
Industry:Astronomy
Laws governing the motions of planets in their orbits:. # the orbits of the planets are ellipses with the sun at a common focus. # the line joining a planet and the sun sweeps over equal areas during equal intervals of time. # the squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Industry:Astronomy
The s. I. Unit of energy, work, or quantity of heat. It is the force of one newton acting over a distance of a meter.
Industry:Astronomy
Any instrument designed for producing and studying interference of two or more trains of waves or beams of electromagnetic radiation of the same range of wavelengths. Usually denotes an optical interferometer that separates a beam of light into two or more parts that travel in different paths and are then combined together to produce interference fringes.
Industry:Astronomy
The alternate light and dark bands that are seen when two beams of homogenous light enter into interference with each other, i. E. , when they overlap and illuminate an identical area.
Industry:Astronomy
