'C21 24 spots' diaporamas de présentation

First spot of cycle 19

First spot of cycle 19. Place: Mt Wilson 60-ft. Date: 13 August 1953. Log. People. Seth Nicholson Solar program head Joe Hickox Solar Observer Harold Babcock MagnetographObservations Hale Lab Clifford Bennett McMath-Hulbert Observer and Discoverer of first spot of cycle 19.

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