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redshift

 [red-shift]  

red·shift

   [red-shift]
noun Astronomy.
a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
Also, red shift.

Origin:
1920–25; red1 + shift
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Redshift is always a great word to know.
So is altitude. Does it mean:
the partial or imperfect shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off
the angular distance of a heavenly body above the horizon
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Collins
World English Dictionary
redshift (ˈredˌʃɪft)
 
—n
Compare: blueshift a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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