The year 1919 in science and technology involved some significant events, listed below. == Astronomy == April – George Ellery Hale and collaborators publish their discovery that the magnetic polarity of sunspot pairs reverses on an 11-year solar cycle and that the polarity varies by hemisphere, which becomes known as Hale's law.
The year 1919 in science and technology involved some significant events, listed below. == Astronomy == April – George Ellery Hale and collaborators publish their discovery that the magnetic polarity of sunspot pairs reverses on an 11-year solar cycle and that the polarity varies by hemisphere, which becomes known as Hale's law.
Source: Wikipedia "1919 in science" · CC BY-SA 4.0
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