Not the moon but..... 1845, The first solar photograph The - TopicsExpress

Not the moon but..... 1845, The first solar photograph The first photographic technique was developed in the 1830s by J. N. Niepce (1765-1833) and Louis Daguerre (1789-1851), and relied on the exposure of a thin iodine layer deposited on a silver substrate, subsequently fixed in a mercury bath. The images so produced became known as daguerrotypes. This imaging technique was very soon applied to astronomy, through the enthusiastic support of the French astronomer and politician Francois Arago (1786-1853), and the British astronomer John Herschel (1792-1871, son of William Herschel), who first coined the term photography, as well as positive and negative images. The first successful daguerrotype of the Sun, reproduced below, was made on 2 April 1845 by the French physicists Louis Fizeau (1819-1896) and Léon Foucault (1819-1868) (the two being perhaps better known for their various pioneering measurements of the speed of light). The exposure was 1/60 of a second. This image shows the umbra/penumbra structure of sunspots, as well as limb darkening. Reproduction of the first daguerrotype of the Sun. The original image was a little over 12 centimeters in diameter. Reproduced from G. De Vaucouleurs, Astronomical Photography, MacMillan, 1961 [plate 1].

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