Keplerian - definition. What is Keplerian
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HYPOTHETICAL TYPE OF ARTIFICIAL SATELLITE THAT EMPLOYS A SOLAR SAIL
Artificial Lagrange point; Non-Keplerian orbit

Kepler orbit         
  • A diagram of the various forms of the '''Kepler Orbit''' and their eccentricities. Blue is a hyperbolic trajectory (''e'' > 1). Green is a parabolic trajectory (''e'' = 1). Red is an elliptical orbit (0 < ''e'' < 1). Grey is a circular orbit (''e'' = 0).
DESCRIBES THE MOTION OF AN ORBITING BODY AS AN ELLIPSE, PARABOLA, OR HYPERBOLA
Keplerian orbit; Kepler orbits
In celestial mechanics, a Kepler orbit (or Keplerian orbit, named after the German astronomer Johannes Kepler) is the motion of one body relative to another, as an ellipse, parabola, or hyperbola, which forms a two-dimensional orbital plane in three-dimensional space. A Kepler orbit can also form a straight line.
Statite         
A statite (from the words static and satellite) is a hypothetical type of artificial satellite that employs a solar sail to continuously modify its orbit in ways that gravity alone would not allow. Typically, a statite would use the solar sail to "hover" in a location that would not otherwise be available as a stable geosynchronous orbit.
Refracting telescope         
  • The Apochromatic lens usually comprises three elements that bring light of three different frequencies to a common focus
  • The Yerkes Great refractor mounted at the 1893 World's Fair in Chicago; the tallest, longest, and biggest aperture refractor up to that time.
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  • This 12 inch refractor is mounted in a dome on a mount that matches the Earth's rotation
  • Astronaut trains with camera with large lens
  • Vienna University Observatory]]
  • Touristic telescope pointed to Matterhorn in Switzerland
  • The Greenwich 28-inch refractor is a popular tourist attraction in 21st century London
  • Alvan Clark polishes the big Yerkes achromatic objective lens, over 1 meter across, in 1896.
  • in}} refractor, at [[Yerkes Observatory]], the largest achromatic refractor ever put into astronomical use (photo taken on 6 May 1921, as Einstein was visiting)
TYPE OF OPTICAL TELESCOPE
Refractor; Refractor telescope; Refractive telescope; Galilean Telescope; Refracting Telescope; Galilean telescope; Keplerian telescope; Keplerian Telescope; Refractor Telescope; Kepler refractor; Galileo Telescope; Galileo's telescope; Refractory telescope
A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses.

ويكيبيديا

Statite

A statite (from the words static and satellite) is a hypothetical type of artificial satellite that employs a solar sail to continuously modify its orbit in ways that gravity alone would not allow. Typically, a statite would use the solar sail to "hover" in a location that would not otherwise be available as a stable geosynchronous orbit. Statites have been proposed that would remain in fixed locations high over Earth's poles, using reflected sunlight to counteract the gravity pulling them down. Statites might also employ their sails to change the shape or velocity of more conventional orbits, depending upon the purpose of the particular statite.

The concept of the statite was invented independently and at about the same time by Robert L. Forward (who coined the term "statite") and Colin McInnes, who used the term "halo orbit" (not to be confused with the type of halo orbit discovered by Robert Farquhar). Subsequently, the terms "non-Keplerian orbit" and "artificial Lagrange point" have been used as a generalization of the above terms.

No statites have been deployed to date, as solar sail technology remains in its infancy. NASA's cancelled Sunjammer solar sail mission had the stated objective of flying to an artificial Lagrange point near the Earth/Sun L1 point, to demonstrate the feasibility of the Geostorm geomagnetic storm warning mission concept proposed by NOAA's Patricia Mulligan.