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by Science Source
$17.00
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Product Details
Our ceramic coffee mugs are available in two sizes: 11 oz. and 15 oz. Each mug is dishwasher and microwave safe.
Design Details
French astronomer, Jules Janssen, poses with his telescope in the late nineteenth century. In this period photography and spectroscopy began to... more
Dimensions
11 oz.
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5 - 7 business days
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French astronomer, Jules Janssen, poses with his telescope in the late nineteenth century. In this period photography and spectroscopy began to extend the power of telescopic observation. Janssen's photographs of the sun were famous were famous. Pierre Jules Cesar Janssen (1824-1907) was a French astronomer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gas helium. In 1857 he went to Peru in order to determine the magnetic equator; in 1861-1862 and 1864, he studied telluric absorption in the solar spectrum in Italy and Switzerland; in 1867 he carried out optical and magnetic experiments at the Azores; he successfully observed both transits of Venus, that of 1874 in Japan, that of 1882 at Oran in Algeria; and he took part in a long series of solar eclipse-expeditions, e.g. to Trani (1867), Guntur (1868), Algiers (1870), Siam (1875), the Caroline Islands (1883), and to Alcosebre in Spain (1905). He was active in the establishment of the astr...
$17.00
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