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 ...

юлиански ден

Astronomy; General astronomy

The interval of time in days (and fraction of a day) since Greenwich noon on Jan. 1, 4713 BC. The JD is always half a day off from Universal Time, because the current definition of JD was introduced ...

равноденствие

Astronomy; General astronomy

Either of the two points (vernal, autumnal) on the celestial sphere where the ecliptic (which is the apparent path of the sun on the sky) intersects the celestial equator. Due to precession, this ...

еклиптика

Astronomy; General astronomy

Явно пътя на слънцето на фона на небето (небесната сфера); формално на средната равнина на земната орбита около ...

небесна сфера

Astronomy; General astronomy

An imaginary sphere of arbitrarily large radius, concentric with the observer, allowing observers to plot positions of objects in the sky when their distances are unknown or unimportant.

астрономическа единица

Astronomy; General astronomy

Approximately equal to the mean earth-sun distance, which is about 150,000,000 km or 93,000,000 miles. Formally, the AU is actually slightly less than the earth's mean distance from the sun ...

елемент със зарядна връзка

Astronomy; General astronomy

Много чувствителна електронно устройство, което е революционен астрономия през 1990. CCD камери са изградени от силициеви чипове че са чувствителни към светлина, промяна открити фотони на светлината ...