General astronomy

General astronomy

Contributors in General astronomy

General astronomy

The change of a solid (such as ice) directly into a gaseous state (bypassing the liquid state). This happens in the vacuum of space with comets, as the heating effects of solar radiation cause ices ...

sekulær bevegelse

Astronomy; General astronomy

Secular variations in the motions of the planets are those that have very slow changes that proceed through ages (''secula'') in a way such that they are nearly proportional with time for a ...

rektascensjonen

Astronomy; General astronomy

One element of the astronomical coordinate system on the sky, which can be though of as longitude on the earth projected onto the sky. Right ascension is usually denoted by the lower-case Greek ...

Perigee

Astronomy; General astronomy

The point where (and when) an object's orbit ''about the earth'' in which it is closest to the earth; only applicable to objects orbiting the earth (not to objects orbiting the sun --- a common ...

perihel

Astronomy; General astronomy

Punktet hvor (og når) et legeme som kretser rundt solen er nærmest solen.

perturbasjoner

Astronomy; General astronomy

Gravitational influences ("tugging" and "pulling") of one astronomical body on another. Comets are strongly perturbed by the gravitational forces of the major planets, particularly by the largest ...

fasevinkel

Astronomy; General astronomy

For a solar system object besides the earth and sun, the angle between the earth and the sun (or the earth's elongation from the sun) as seen from that third object. The phase angle is given in ...