PIX4629399: Kepler's Law - Illustration - The segment that connects the planet to the Sun sweeps equal areas in equal times. In other words, the speed of a planet becomes greater when the planet approaches the Sun. It is maximum in the vicinity of the shortest radius (perihelie), and minimal in the vicinity of the largest radius (aphelie). Second Kepler's law, the line joining a planet and the Sun sweeps out equal areas during equal intervals of time. The planet moves faster near the Sun, so the same area is swept out in a given time as at larger distances, where the planet moves more slowl / Bridgeman Images
PIX4629421: Geocentric System of Ptolemee - Ptolemaic Cosmology - Engraving from “Harmonia Macrocosmica” by Andreas Cellarius, 1708. The planisphere of Ptolemy, or the mechanism of the heavenly orbits following the hypothesis of Ptolemy laid out in a planar view. Plate of the Harmonia Macrocosmica of Andreas Cellarius, 1708 / Bridgeman Images
PIX4629516: Geocentric System according to Aratus - Geocentric System - Representation of the geocentric system according to Aratus (Aratos de Soles). Engraving from “Harmonia Macrocosmica” by Andreas Cellarius, 1660-1661. The planisphere of Aratus, or the mechanism of the heavenly orbits following the hypothesis of Aratus laid out in a planar view. Plate of the Harmonia Macrocosmica of Andreas Cellarius, 1660-1661 / Bridgeman Images
PIX4665258: La Rochelle et l'ile de Re - Photo satellite - Satellite image of La Rochelle - France: La Rochelle et l'île de Re observed by satellite Sentinel-2A on 26 December 2015. - Capital of the Charente-Maritime department in western France, La Rochelle and surroundings are featured in this Sentinel-2A image, captured on 26 December 2015. Home to some 80,000 people, La Rochelle is a city and a seaport on the Bay of Biscay, a part of the Atlantic Ocean, connected to the Ile de Re by a 2.9 km-long bridge, clearly visible in the centre of the image / Bridgeman Images
PIX4665539: Plaque de la rue Cassini in Paris - Street Plaque in Paris - Rue du 14eme arrondissement de Paris, in tribute to the Italian astronomer Jean - Dominique Cassini (1625 - 1712), naturalise French in 1673. Attrained to France by Colbert in 1669, he became the first director of the Paris Observatory in 1671, at the request of Louis XIV. In 1665, he discovered Jupiter's Grande Tache Rouge and determined the rotation speeds of Venus, Mars and Jupiter. From 1671 he discovered 4 satellites around Saturn, as well as a separation in the rings, which today bears his name (division of Cassini). In 1673, he made the first precise measurement of the distance from Earth to Sun, thanks to a transit of Venus. Rue Cassini, street sign. Astronomer Jean - Dominique Cassini, was the first director of Paris observatory / Bridgeman Images
PIX4665636: Plaque de la rue Janssen a Paris - Street Plaque in Paris - Rue du XIXeme arrondissement de Paris, in tribute to Jules Janssen (1824 - 1907). A pioneer of astronomical photography, he created the first images of solar granulation. He was the founder of the Observatoire de Meudon, which he directed from 1876 until his death. Janssen Street, street sign. Jules Janssen (1824 - 1907) was a english astronomer, director of Meudon observatory / Bridgeman Images
PIX4665864: Mediterranean Sea and Detroit of Gibraltar seen from Space - Strait of Gibraltar and Mediterranean sea from space - The Detroit of Gibraltar seen by the International Space Station (ISS) in 2001. Morocco is on the left, Spain is on the right. Strait of Gibraltar as seen from the International Space Station (ISS) in 2001. Morocco is visible on the left, and Spain on the right / Bridgeman Images
PIX4665078: English Channel seen from space - English Channel seen from space - La Manche seen by Envisat satellite on 14 July 2003. This image taken by satellite ENVISAT on July 14 2003, shows the English Channel separating the island of Great Britain from northern France, it also connects the North Sea to the Atlantic. The Strait of Dover is the narrowest point, only 34 km, from Dover to Cape Gris - Nez. In the upper part of the image most of England can be observed, from Plymouth to Margate along the coast and from Bristol to London (large bright area). The light green - bluish colours in the sea are the shallow waters of the Goodwin Sands. On the opposite side of the channel are the French regions of Brittany and Lower Normandy. To the left of Lower Normandy are the British islands of Jersey and Guernsey / Bridgeman Images
PIX4666053: Retreat of the Helheim Glacier, Greenland - Retreat of the Helheim Glacier, Greenland - These three photos show the Helheim Glacier in Greenland in June 2005 (top), July 2003 (middle) and May 2001 (bottom). The glacier occupies the left part of the images, the icebergs on the fjord on the right. Between 2001 and 2005, the glacier front retreated 7.5 km. Images obtained from the Terra satellite. Retreat of the Helheim Glacier, Greenland Along the margin of the Greenland Ice Sheet, outlet glaciers flow as icy rivers through narrow fjords and out to sea. As long as the thickness of the glacier and the depth of the water allow the ice to remain grounded, it stays intact. Where the ice becomes too thin or the water too deep, the edge floats and rapidly crumbles into icebergs. Satellite observations of eastern Greenland's Helheim Glacier show that the position of the iceberg's calving front, or margin, has undergone rapid and dramatic change since 2001, and the glacier's flow to the sea has sped up as well. These images from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on Nasa's Terra satellite show the Helheim glacier in June 2005 (top), July 2003 (middle), and May 2001 (bottom). The glacier occupies the left part of the images, while large and small icebergs pack the narrow fjord in the right part of the images. Bare ground appears brown or tan, while vegetation appears in shades of red. From the 1970s until about 2001, the position of the glacier's margin changed little. But between 2001 and 2005, the margin retreated landward about 7.5 kilometers (4.7 miles), and its speed increased from 8 to 11 kilometers per year. Between 2001 and 2003, the glacier also thinned by up to 40 meters (about 131 feet). Overall, the margins of the Greenland Ice Sheet have been thinning by tens of meters over the last decade / Bridgeman Images