Caption: Click on the image to go to a web page that illustrates the identification of astronomical objects by blink comparison.

Clyde Tombaugh (1906--1997) discovered Pluto using blink comparison in 1930---just up the hill from Flagstaff, Arizona at the Lowell Observatory.

Tombaugh did it by human eye, nowadays it's done by the computer, almost certainly using AI sometimes.

Credit/Permission: © David Jeffery, 2004 / Own work.
Image link: blink.html.
Local file: local link: blink_insert.html.
File: Pluto file: blink_insert.html.