PIX4580977: Circumpolar - China - Star trails around north celestial pole - Photographic pose around the polar star. Prairie Kalajun, Xinjiang, China, 27 July 2008. Startrail taken from Kalajun Prairie, Xinjiang, China on Jul 27, 2008 / Bridgeman Images

PIX4580980: Circumpolar - Annapurna - Annapurna Startrail - Photographic pose around the polar star. Ghandruk, Nepal, 9 November 2009. Startrail taken from Ghandruk, Nepal on Nov. 09, 2009 / Bridgeman Images

MDA4581012: Habitat 67 a Montreal, Canada. Architect Moshe Safdi, 1967. Photograph 11/08/99., Safdie, Moshe (b.1938) / Bridgeman Images

MDA4581040: Olympic stadium and equipment in Montreal (Canada). Architect Roger Taillibert, 1976-1987. Photography 11/08/99., Taillibert, Roger (1926-2019) / Bridgeman Images

MDA4581064: The 1967 United States Pavilion of the World Exposition in Montreal (Canada), created by Richard Buckminster and Shoji Sadao. Photography 11/08/99. / Bridgeman Images

MDA4581075: The castle of Fontenac (1892) in Quebec, Canada. / Bridgeman Images

MDA4581088: Habitat 67 a Montreal, Canada. Architect Moshe Safdi, 1967. Photograph 11/08/99., Safdie, Moshe (b.1938) / Bridgeman Images

MDA4581094: Sydney Bay, Australia. Photography 01/07/00. / Bridgeman Images

PIX4581095: Star Trains on the Observatory of Siding Spring - Star trails above Anglo - Australian Observatory - Photographic installation of several hours and dome of Siding Spring's 3.9m telescope. As the earth rotates the stars appear to move across the sky, as do the more obvious sun and Moon This effect is easily recorded by leaving a camera outdoors with its shutter open during the night. To make this picture, the camera was pointed to the southwest, towards the dome of the AAT, from the UK Schmidt building on Siding Spring Mountain in New South Wales / Bridgeman Images

PIX4581098: Circumpolar - South Hemisphere - Star trails around the south celestial pole - Photographic pose of several hours around the south celeste pole. Siding Spring's 3.9m telescope dome in the foreground. The reddish color of the sky is due to the volcanic eruption of the Pinatubo. On June 15, 1991, after weeks of rumbling and venting steam and poisonous gas, Mt Pinatubo exploded on the island of Luzon, in the Phillipines. This was the largest volcanic eruption for nearly a century. The eruption killed over 700 people and ejected several cubic kilometers of dust and gas over 35 km high into the stratosphere. The effects were felt around the world and included a temporary global cooling and a thinning of the ozone layer as well as other changes in the global weather pattern. However, the most obvious effect for many people was a milkiness in the daytime sky due to scattering by high altitude aerosols, and corresponding anomalous sunsets and twilights that were noticable for years. This picture was made in early 1992, two hours after sunset, when it is usually completely dark. However, high altitude dust in the stratosphere reflected sunset colours strongly enough for them to be seen (in the sky, at right) and to be reflected again, by the AAT dome. The red reflection was captured in this six - hour exposure. Here the camera is pointing due south, directly at the south celestial pol / Bridgeman Images

MDA4581139: Sydney Opera House (Australia). Architect Jorn Utzon 1957-1973. Photograph 03/07/00., Utzon, Jorn (1918-2008) / Bridgeman Images

PIX4581183: Circumpolar - Southern hemisphere - Southern Sky and Milky Way (Lake Titicaca, Bolivia) - Lake Titicaca. The southern stars gracefully arc over a shore - side cabana at Lake Titicaca. The long time exposure demonstrates the rotation of Earth on its axis by revealing the apparent motions of the stars / Bridgeman Images

PIX4581189: Circumpolar - southern hemisphere - Southern Sky & Milky Way (Lake Titicaca, Bolivia) - Lake Titicaca A long time exposure reveals the motion of the stars against a foreground of reel huts and a scale model of Thor Heyerdal's Ra II / Bridgeman Images

PIX4581298: Circumpolar - South Hemisphere - Circumpolar - Southern hemisphere - Photographic installation around the south celestial pole. Bad Cap, The Reunion. Startrail at Cap Mechan / Bridgeman Images

PIX4581507: The Pleiades cluster with zodiacal light - The Pleiades cluster with zodiacal light - The zodiacal light that extends here from the bottom right of the image to the Pleiades and the Taurus, comes from the reflection of the light of the Sun on the countless interplanetary dust; it draws the plane of the Solar System. The faint cone of light extending from the horizon along the ecliptic is known as zodiacal light. It comes from the reflexion of the sun's light off tiny interplanetary dust particles in the plane of the solar system. One can see it here from the bottom right of the image to beyond the Pleiades cluster in the center of the image / Bridgeman Images

PIX4581790: Lighthouse and starry night - Lighthouse and starry night - The light beam at the end of the Audierne dam draws a cone of light in the night. Brittany, 27 September 2008. The light beam of the lighthouse located at the end of the dike of Audierne is drawing a cone in the night. Brittany, 27 September 2008 / Bridgeman Images

PIX4581929: Star sky above the castle of Lordat (09) - Starry sky above the castle of Lordat - Star sky above the castle of Lordat in Ariege. Starry sky above the castle of Lordat / Bridgeman Images

PIX4581941: The castle of Roquefixades (09) under the stars - Starry sky above the castle of Roquefixade - Star sky above the cathar castle of Roquefixade in Ariege. Starry sky above the Cathar castle of Roquefixade / Bridgeman Images

PIX4581943: The castle of Saissac (11) under the stars - Starry sky above the castle of Saissac - Sky star above the Cathar castle of Saissac, in Aude. Starry sky above the Cathar castle of Saissac / Bridgeman Images

PIX4581954: Castle of Saint Barthelemy under the stars - Starry sky above the castle of Saint - Barthelemy - Star sky above the ruins of the dungeon of the castle of Saint - Barthelemy in Ariege (Durban - sur - Arize). Starry sky above the castle of Saint - Barthelemy in Ariege (Durban - sur - Arize). 12th - 16th century / Bridgeman Images

PIX4581968: The castle of Roussillon under the stars - Starry sky above the castle of Roussillon - Sky star above the castle of Roussillon in the Lot. Starry sky above the castle of Roussillon in Lot department / Bridgeman Images

PIX4581981: The castle of Roussillon under the stars - Starry sky above the castle of Roussillon - Sky star above the castle of Roussillon in the Lot. Starry sky above the castle of Roussillon in Lot department / Bridgeman Images

PIX4582045: Star Sky and Moonlight in Atacama Desert - Starry sky with moonlight in Atacama desert - Star Sky and Moonlight in Atacama Desert, Chile, May 2009. Starry sky with moonlight in Atacama desert, Chile, May 2009 / Bridgeman Images

PIX4582046: Star Sky and Moonlight in Atacama Desert - Starry sky with moonlight in Atacama desert - Star Sky and Moonlight in Atacama Desert, Chile, May 2009. Starry sky with moonlight in Atacama desert, Chile, May 2009 / Bridgeman Images

PIX4582055: Phare breton et voie lactee - Milky way above a lighthouse in Brittany - Ciel d'summer seen on June 24, 2009 in Ploumanac'h (Cotes d'Armor). Summer sky seen at Ploumanac'h (Cotes d'Armor), Brittany, June 24 2009 / Bridgeman Images

PIX4582060: Star sky above the Pont du Gard - Starry sky above the Pont du Gard - Star sky above the Pont du Gard / Bridgeman Images

PIX4582069: Sky star on Brittany - Starry sky in Brittany - Sky d'summer seen on June 24, 2009 in Ploumanac'h (Cotes d'Armor). Summer sky seen at Ploumanac'h (Cotes d'Armor), Brittany, June 24 2009 / Bridgeman Images

ITR4582187: Detail of architecture in Avoriaz (Haute Savoie). Achitectes Jacques Labro and Jean-Jacques Orzoni, 1966., Labro, Jacques (b.1935) & Orzoni, Jean-Jacques (1935-2009) / Bridgeman Images

ITR4582192: Avoriaz (Haute Savoie) Architects Jacques Labro and Jean Jacques Orzoni, 1966., Labro, Jacques (b.1935) & Orzoni, Jean-Jacques (1935-2009) / Bridgeman Images

ITR4582194: Detail of architecture in Avoriaz (Haute Savoie). Architects Jacques Labro and Jean Jacques Orzoni, 1966., Labro, Jacques (b.1935) & Orzoni, Jean-Jacques (1935-2009) / Bridgeman Images

PIX4584926: Sphere Armillaire du Lycee Henri IV a Paris - Armillary sphere. Henri IV school, Paris - Sphere armillaire set up in the courtyard of the Meridian of Lycee Henri IV, in Paris. It dates back to 1850. It is composed of two circular iron rings, one vertical, in the plane of the Meridian, the other, graded, in the plane of the Equator. A long metal stem crosses diametrally the Meridian circle, representing the axis of the poles. The shadow projected by the axis of the poles on the inner edge of the equatorial circle allows us to know the moment of the passage from the Sun to the local meridian (true midday). Armillary sphere of 1850 in Lycee Henri IV, Paris / Bridgeman Images

PIX4585009: Sundial - Paris - Sundial in Paris - Sundial de la rue Saint Maur, à Paris (Xeme) Dial dating from 1907, decorated with a Tournesol. Sundial in Paris, rue Saint Maur, 75010 / Bridgeman Images

PIX4585029: Sundial - Sundial - 18th century lime-painted sundial from Church Saint Hippolyte Sainte Radegonde in Arbanats, France. Lime - painted sundial of the 18th century at Saint Hippolyte Sainte Radegonde church, Arbanats, France / Bridgeman Images

PIX4585035: Sundial Val de Grace - Paris - Sundial in Paris - Sundial 1638 - Abbaye du Val de Grace 75005 Sundial dated 1638 located in Val de Grace, Paris / Bridgeman Images

PIX4585052: La Mire sud du meridien de Paris - Southern marker of the Paris meridian line - Mire du sud, located in Parc Montsouris. It was used as an adjustment for the Meridian bezel of the Paris Observatory. Formerly located on the Meridian of Paris, it was moved 35 metres east when the park was laid out. 5 - meter high obelisk in Parc Montsouris used for the Paris meridian line / Bridgeman Images

PIX4585079: Church Saint Sulpice, Paris. Meridienne - Church Saint - Sulpice, Paris. The meridian line and the obelisk - 1743 - View of the grave pedestal of the obelisk and the meridian / Bridgeman Images