Tag Archives: stars

where do the stars go in the daytime?

Galloway Forest Park in Scotland has picked up an international award as one of the best places for stargazing in the world. The 300sq mile Forestry Commission site has been commended for its dark skies and named one of the best places in the world for stargazing.



So where do the stars go in the daytime? The answer is that they are still there of course. It is a nice reminder that our colour vision is more about contrast than about absolute intensities. With old TV sets when they were switched off the screens were grey; but when they were turned on it would be possible to see some really dark blacks. But the screen cannot emit less light than when it is turned off! So the black looks black because of contrast, not simply because of the amount of light emitted or not emitted.

Against the dark skies of night the stars contrast and appear bright – during the day, the skies are much brighter because of the sun and though the light from the stars is just as intense as it is at night the contrast conditions are very different.