So we will measure a smooth dip in the brightness of the star at regular intervals as the planet passes in front. (myscizzle.com)
Those playing the shoot -»em - up games saw a boost in their «contrast sensitivity function,» or the ability to discern subtle changes in the brightness of an image. (huffingtonpost.com)
Scientists began measuring variations in the brightness of the sun as soon as the engineers got around to building the instruments. (realclimate.org)