From Rise: The Vieneo Province - The Space Simulator MMO from Unistellar Industries, LLC

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In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory.

To completely describe an orbit mathematically, six quantities must be calculated. These quantities are called orbital elements, or Keplerian elements. They are:

  1. Semi-major axis length apopsis to center of the ellipse.
  2. Eccentricity, a measurement of the orbit’s ellipse (an eccentricity of zero indicates a circular orbit. Written as E
    1. Eccentricity = ((Major axis2)-(Minor axis2)/Major axis).
  3. Inclination, the angular distance of the orbital plane from the plane of the planet’s equator: Written as I
  4. Periapsis is the elevation closest to the planet: Written as AP
  5. Apopsis is the elevation furthest from the planet surface: Written as AA

As a pilot you will be most concerned with the E and AP.
If you have a high E you are either risking flying of in to space or crashing in to the planet.
Obviously if you have a High E and AP is counting down to 0 you really need to start thinking about how not to crash in to the planet.
rana 15:16, 14 March 2007 (HKT)

Useful things pilots want to know

TVM Get to Target in the shortest route.
DOR Get in a prefect circular orbit using least fuel.