colour index

noun

astronomy the difference between the apparent magnitude of a star measured in one standard waveband and in a longer standard waveband, indicating its colour and temperature
geology the sum of the dark or coloured minerals of a rock, expressed as a percentage of the total minerals
chem physics a systematic arrangement of colours according to their hue, saturation, and brightness

Words nearby colour index

colour code, colour commentator, colour contrast, colour filter, colour guard, colour index, colour line, colour phase, colour scheme, colour separation, colour separation overlay

Example sentences from the Web for colour index

  • From each catalogue of visual magnitudes of the stars we may obtain their photographic magnitude through adding the colour-index.

    Lectures on Stellar Statistics |Carl Vilhelm Ludvig Charlier

  • The difference between the photographic and the visual magnitudes is called the colour-index (c).

    Lectures on Stellar Statistics |Carl Vilhelm Ludvig Charlier

  • Instead of s there may also be used another expression for the colour, called the colour-index.

    Lectures on Stellar Statistics |Carl Vilhelm Ludvig Charlier