Pronunciation: /ˌɪn kləˈneɪ ʃən/ Explain

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Manipulative 1 - Inclination Created with GeoGebra.

An inclination is the angle between a reference line or plane and another line or plane. In manipulative 1, the inclination of the line is respective to the x-axis. Note that the inclination is measured with an angle between 0° and 90° (0° < α ≤ 90°).

An incline is a surface that is sloped relative to the horizontal.

An inclined plane is a plane that is sloped relative to a reference plane. For astronomical objects, the reference plane contains the equator of the object about which another object orbits.

In manipulative 2, the blue ellipse represents a plane containing the equator of a star. The red ellipse represents a plane containing the orbit of a planet.


  1. Alessandra Celletti, Ettore Perozzi. Celestial Mechanics: The Waltz of the Planets. pg 9. Springer. January 24, 2007. Buy the book
  2. Michael D. Griffin, James R. French. Space Vehicle Design. 2nd edition. pp 20-22. American Institute of Aeronautics & Astrophysics. March 2004. Buy the book

Cite this article as:

McAdams, David E. Inclination. 8/7/2018. All Math Words Encyclopedia. Life is a Story Problem LLC.

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8/6/2018: Initial version. (McAdams, David E.)

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