Fechner is a lunar crater that lies on the far side of the Moon's southern hemisphere, attached to the western rim of the large Planck walled-plain. The eastern rim of Fechner intersects the Vallis Planck, a long, wide cleft in the surface that follows a course to the north-northwest. This valley intrudes into the southeastern rim of the crater, then continues northward from the periphery of the northeast rim.

German physicist who founded psychophysics; derived Fechner's Law on the basis of early work by E. H. Weber (1801-1887)

(1801-1887)