# Constant of aberration

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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 value, when ascertained (as by observation) and substituted in a general mathematical formula expressing an astronomical law, completely determines that law and enables predictions to be made of its effect in particular cases. [Webster 1913 Suppl.]

4. (Physics) A number expressing some property or condition of a substance or of an instrument of precision; as, the dielectric constant of quartz; the collimation constant of a transit instrument. [Webster 1913 Suppl.]

5. (Computers) a data structure that does not change during the course of execution of a program. It may be a number, a string, or a more complex data structure; -- contrasted with {variable}. [PJC]

{Aberration constant}, or {Constant of aberration} (Astron.), a number which by substitution in the general formula for aberration enables a prediction to be made of the effect of aberration on a star anywhere situated. Its value is 20[sec].47.

{Absolute constant} (Math.), one whose value is absolutely the same under all circumstances, as the number 10, or any numeral.

{Arbitrary constant}, an undetermined constant in a differential equation having the same value during all changes in the values of the variables.

{Gravitation constant} (Physics), the acceleration per unit of time produced by the attraction of a unit of mass at unit distance. When this is known the acceleration produced at any distance can be calculated.

{Solar constant} (Astron.), the quantity of heat received by the earth from the sun in a unit of time. It is, on the C. G. S. system, 0.0417 small calories per square centimeter per second. --Young. [Webster 1913 Suppl.]

{Constant of integration} (Math.), an undetermined constant added to every result of integration. [1913 Webster + Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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• constant of aberration — the maximum apparent displacement of a star from its mean position due to the aberration of light corresponding to the earth s orbital motion and having a value of about 20.5 seconds of angle …   Useful english dictionary

• 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

• 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 value, when… …   The Collaborative International Dictionary of English

• Constant of integration — 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

• 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

• 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 De La Lumière — L aberration de la lumière a été découverte par l astronome James Bradley en 1725, mais seulement publiée en 1727. Elle se traduit par le fait que la direction apparente d une source lumineuse dépend de la vitesse de celui qui l observe, de la… …   Wikipédia en Français

• Aberration de la lumiere — Aberration de la lumière L aberration de la lumière a été découverte par l astronome James Bradley en 1725, mais seulement publiée en 1727. Elle se traduit par le fait que la direction apparente d une source lumineuse dépend de la vitesse de… …   Wikipédia en Français

• aberration constant — aberacijos kampas statusas T sritis fizika atitikmenys: angl. aberration angle; aberration constant; angle of aberration vok. Aberrationskonstante, f; Aberrationswinkel, m rus. постоянная аберрации, f; угол аберрации, m pranc. angle de… …   Fizikos terminų žodynas

• Aberration de la lumière — Le phénomène de l aberration de la lumière a été découvert par l astronome James Bradley en 1725, mais seulement publié en 1727. Il se traduit par le fait que la direction apparente d une source lumineuse dépend de la vitesse de celui qui l… …   Wikipédia en Français