equilux

Noun

Meaning

An isophot.

A day in which the durations of light and darkness are equal, contrasted with an equinox, where they may differ slightly due to the angular diameter of the sun and atmospheric refraction.

Examples

To avoid this ambiguity, the word equilux is sometimes used to mean a day in which the durations of light and darkness are equal. citation This meaning of "equilux" is rather modern (c. 2006) and unusual. Source: Internet

Technical references since the beginning of the 20th century (c. 1910) use the terms "equilux" and "isophot" to mean "of equal illumination" in the context of curves showing how intensely lighting equipment will illuminate a surface. Source: Internet

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