- star aberration
- n зоряна аберація
English-Ukrainian military dictionary. 2015.
star aberration
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Aberration of light — Light from location 1 will appear to be coming from location 2 for a moving telescope due to the finite speed of light, a phenomenon known as the aberration of light. The aberration of light (also referred to as astronomical aberration or stellar … Wikipedia
Star position — The position of stars on the sky are defined by a couple of angles, similar to the geographic latitude and longitude. These two angles which refer to the celestial equator are called Declination (abbrev. δ or Dec ) and Right ascension ( α or RA ) … Wikipedia
aberration, constant of — ▪ astronomy in astronomy, the maximum amount of the apparent yearly aberrational displacement of a star or other celestial body, resulting from the Earth s orbital motion around the Sun. The value of the constant, about 20.49″ of arc,… … Universalium
Aberration constant — Constant Con stant, n. 1. That which is not subject to change; that which is invariable. [1913 Webster] 2. (Math.) A quantity that does not change its value; used in countradistinction to {variable}. [1913 Webster] 3. (Astron.) A number whose… … The Collaborative International Dictionary of English
Star diagonal — A star diagonal is an angled mirror or prism used in telescopes that allows viewing of objects that are at a 90° angle from the direction the telescope is pointing. It allows convenient and comfortable viewing when the telescope is pointed at, or … Wikipedia
aberration of starlight — Apparent displacement of a star or other celestial body resulting from Earth s orbital motion around the Sun. The maximum displacement is about 20.49 seconds of arc. It depends on the ratio of Earth s orbital speed to the speed of light and Earth … Universalium
ABERRATION OF LIGHT — an apparent motion in a star due to the earth s motion and the progressive motion of light … The Nuttall Encyclopaedia
Spherical aberration — shape of lenses and mirrors. This is an important effect, as spherical shapes are much easier to produce than aspherical and so most lenses have spherical shapes. Positive spherical aberration means peripheral rays are bent too much. Negative… … Wikipedia
Constant of aberration — Constant Con stant, n. 1. That which is not subject to change; that which is invariable. [1913 Webster] 2. (Math.) A quantity that does not change its value; used in countradistinction to {variable}. [1913 Webster] 3. (Astron.) A number whose… … The Collaborative International Dictionary of English
Diurnal aberration — Diurnal Di*ur nal, a. [L. diurnalis, fr. dies day. See {Deity}, and cf. {Journal}.] 1. Relating to the daytime; belonging to the period of daylight, distinguished from the night; opposed to {nocturnal}; as, diurnal heat; diurnal hours. [1913… … The Collaborative International Dictionary of English
angle of aberration — angle of aberration, the angle between the actual and the apparent position of a star or other heavenly body to an observer. See aberration (def. 5). (Cf. ↑aberration) … Useful english dictionary
