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The Bethungra Spiral is a heritage-listed rail spiral on the Main Southern line near Bethungra, between Junee and Cootamundra. The spiral carries the northbound track, forming a part of the Sydney–Melbourne rail corridor. [1] [2] It is a listed heritage item, having been added to the New South Wales State Heritage Register on 2 April 1999. [3]
The Milky Way is a barred spiral galaxy with a D 25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), [10] but only about 1,000 light-years thick at the spiral arms (more at the bulge).
The word parkour derives from parcours du combattant (obstacle course), the classic obstacle course method of military training proposed by Georges Hébert. [22] [23] [24] Raymond Belle used the term "les parcours" to encompass all of his training including climbing, jumping, running, balancing, and the other methods he undertook in his personal athletic advancement. [25]
The Downward Spiral is the second studio album by the American industrial rock band Nine Inch Nails, released on March 8, 1994, by Nothing Records in the United States and Island Records in Europe. It is a concept album detailing the self-destruction of a man from the beginning of his misanthropic "downward spiral" to his suicidal breaking point.
The heliospheric current sheet, or interplanetary current sheet, is a surface separating regions of the heliosphere where the interplanetary magnetic field points toward and away from the Sun. [1] A small electrical current with a current density of about 10 −10 A /m 2 flows within this surface, forming a current sheet confined to this surface.
Jinjiazhuang Tunnel (Chinese: 金家庄隧道) or Jinjiazhuang Spiral Tunnel (Chinese: 金家庄螺旋隧道), is the world's longest highway spiral tunnel. [1] [2] The spiral has a curve radius of 860 metres (2,820 ft) and the elevation difference between the tunnel entrance and exit is 112 metres (367 ft).
A two-dimensional Poincaré section of the forced Duffing equation. In mathematics, particularly in dynamical systems, a first recurrence map or Poincaré map, named after Henri Poincaré, is the intersection of a periodic orbit in the state space of a continuous dynamical system with a certain lower-dimensional subspace, called the Poincaré section, transversal to the flow of the system.
A spiral bridge, loop bridge, helix bridge, or pigtail bridge is a road bridge which loops over its own road, allowing the road to climb rapidly. This is useful in steep terrain, or where the approach road to a bridge would terminate too far from the bridge's end. Despite its name, the typical shape of a spiral bridge forms a helix, not a spiral .