Which number replaces the qu...
Which number replaces the question mark?Correct answers: 340
The first user who solved this task is Roxana zavari.
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First eclipse photoIn 1851, a total solar eclipse was first captured on a daguerreotype photograph by Busch and Berkowski, at the Royal Observatory in Königsberg, Prussia (now Kalinigrad in Russia). It showed a slight but distinct impression of the corona duringthe total eclipse. Berkowski, a local daguerrotypist whose first name was never published, observed at the Royal Observatory. A small 6-cm refracting telescope was attached to a 15.8-cm Fraunhofer heliometer and a 84-second exposure was taken shortly after the beginning of totality.«[Image: Fraunhoffer heliometer at the Royal Observatory of Königsberg c. 1851 which was used to make first photograph of a total solar eclipse.] |