"1913-04-06Z"^^ . "2012-04-09Z"^^ . . . . . . "Gerald Kron"@en . . . "Gerald Kron (April 6, 1913 \u2013 April 9, 2012) was an American astronomer who was one of the pioneers of high-precision photometry with photoelectric instrumentation. He discovered the first starspot and made the first photometric observation of a stellar flare.A graduate of the University of Wisconsin-Madison, where he earned a Master of Science degree in mechanical engineering in 1934, Kron became interested in astronomy, which he studied under Joel Stebbins."@en . .