General astronomy

General astronomy

Contributors in General astronomy

General astronomy

The branch of astronomy that deals with measuring the positions of celestial objects, especially stars. Astrometrists measure parallaxes and proper motions, which allow astronomers to determine the ...

astronomer

Astronomy; General astronomy

a scientist specializing in astronomy

astronomical horizon event

Astronomy; General astronomy

The time and azimuth at which a celestial body crosses the astronomical horizon of an oberver.

astronomical refraction

Astronomy; General astronomy

The change in direction of travel (bending) of a light ray as it passes obliquely through the atmosphere. As a result of refraction, the observed altitude of a celestial object is greater than its ...

astronomical unit (AU)

Astronomy; General astronomy

1) Mean distance between the Earth and the Sun: 1.495985 × 1011 m. 2) The AU is the preferred unit for distances within the solar system. Mercury, the innermost planet, lies on average 0.39 AU from ...

astronomy

Astronomy; General astronomy

The science that studies the natural world beyond the earth.

astrophysics

Astronomy; General astronomy

The science that studies the physics and chemistry of extraterrestrial objects. The alliance of physics and astronomy, which began with the advent of spectroscopy, made it possible to investigate ...