Pickering's list is a test of visual acuity devised by William Pickering (brother and assistant to E. C. Pickering) which lists twelve lunar features in order of increasing difficulty. It was featured in the June 1997 issue of Astronomy (pp82-85).
|1)||Bright surroundings of Copernicus|
|4)||Bright surroundings of Kepler|
|5)||Region of Gassendi|
|6)||Notch in the Mare Tranquillitatis-Plinius region|
|8)||Light area around crater Lubiniezky|
|10)||Shaded area near the walled plain Sacrobosco|
|11)||Dark spot at the foot of the Apennines|