General astronomy

General astronomy

Contributors in General astronomy

General astronomy

Exactly 365. 25 days, in which a century (100 years) is exactly 36525 days and in which 1900. 0 corresponds exactly to 1900 January 0. 5 (from the Julian-date system, which is half a day different ...

delta

Astronomy; General astronomy

The upper-case Greek letter used to denote an object's geocentric distance in ephemeris tables; see "ephemeris". (Note that lower-case delta is used to denote declination. )

angular size

Astronomy; General astronomy

The angle subtended by an object on the sky. For example, the angular size of the moon is 30 arcminutes.

anisotropy

Astronomy; General astronomy

The condition in which the universe appears different in different directions.

angular momentum (L)

Astronomy; General astronomy

1) The angular momentum of a system about a specified origin is the sum over all the particles in the system (or an integral over the different elements of the system if it is continuous) of the ...

angstrom

Astronomy; General astronomy

A unit of length used when expressing wavelengths.

annular eclipse

Astronomy; General astronomy

1) A solar eclipse in which the solar disk is never completely covered but is seen as an annulus or ring at maximum eclipse. An annular eclipse occurs when the apparent disk of the Moon is smaller ...