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Rotation of the line of apsides in the plane of the orbit; (in a binary) precession of the line of apsides due to mutual tidal distortion.
Industry:Astronomy
colourless, odourless gas comprising 1% of the atmosphere
Industry:Astronomy
Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.
Industry:Astronomy
a telescope composed of an array of separete individual elements acting in concert
Industry:Astronomy
a metalloid element with two main forms, grey α arsenic and β arsenic
Industry:Astronomy
In the orbit of a solar-system body, the point where the body crosses the ecliptic from south to north: for a star, out of the plane of the sky toward the observer.
Industry:Astronomy
