1 of 5000

|

metal prints paris metal prints telescope metal prints science metal prints history metal prints historic metal prints historical metal prints famous metal prints important metal prints notable metal prints well-known metal prints figure metal prints person metal prints personality metal prints people metal prints personalities metal prints

photographs paris photos telescope photos science photos history photos historic photos historical photos famous photos important photos notable photos well-known photos figure photos person photos personality photos people photos personalities photos

Add This Artwork to Your Favorites Collection

Comment

Add This Artwork to Your Favorites Collection

Comment

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...