Normal equation. See under Normal.Personal equation(Astron.), the difference between an observed result and the true qualities or peculiarities in the observer; particularly the difference, in an average of a large number of observation, between the instant when an observer notes a phenomenon, as the transit of a star, and the assumed instant of its actual occurrence; or, relatively, the difference between these instants as noted by two observers. It is usually only a fraction of a second; — sometimes applied loosely to differences of judgment or method occasioned by temperamental qualities of individuals.Theory of equations(Math.), the branch of algebra that treats of the properties of a single algebraic equation of any degree containing one unknown quantity.

a timepiece made to exhibit the differences between mean solar and apparent solar time. Knight.


  By PanEris using Melati.

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