Mach bands change asymmetrically during solar eclipses.
Observations made during two partial eclipses of the Sun show that the Mach bands on shadows cast by the Sun disappear and reappear asymmetrically as an eclipse progresses. These changes can be explained as due to changes in the shape of the penumbras of shadows as the visible portion of the Sun forms crescents of different orientation.
Ross
John
J
School of Psychology, University of Western Australia, Crawley, Australia. jr@psy.uwa.edu.au
Diamond
Mark R
MR
Badcock
David R
DR
D006801:Humans; D009903:Optical Illusions; D016082:Solar System; D014796:Visual Perception / Q000502:physiology*