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  2. Eccentricity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Eccentricity_(mathematics)

    In mathematics, the eccentricity of a conic section is a non-negative real number that uniquely characterizes its shape. One can think of the eccentricity as a measure of how much a conic section deviates from being circular. In particular: The eccentricity of a circle is 0. The eccentricity of an ellipse which is not a circle is between 0 and 1.

  3. Orbital eccentricity - Wikipedia

    en.wikipedia.org/wiki/Orbital_eccentricity

    The mean eccentricity of an object is the average eccentricity as a result of perturbations over a given time period. Neptune currently has an instant (current epoch ) eccentricity of 0.011 3 , [ 13 ] but from 1800 to 2050 has a mean eccentricity of 0.008 59 .

  4. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    A point has a solid construction if it can be constructed using a straightedge, compass, and a (possibly hypothetical) conic drawing tool that can draw any conic with already constructed focus, directrix, and eccentricity. The same set of points can often be constructed using a smaller set of tools.

  5. Little Professor - Wikipedia

    en.wikipedia.org/wiki/Little_Professor

    As the first electronic educational toy, [6] [7] the Little Professor is a common item on calculator collectors' lists. [8] In 1976, the Little Professor cost less than $20. More than 1 million units sold in 1977. [9]

  6. Horizontal eccentricity - Wikipedia

    en.wikipedia.org/wiki/Horizontal_eccentricity

    Horizontal eccentricity refers to the horizontal axis, measured in degrees, along the visual field. The blind spot extends from an eccentricity d 1 to eccentricity d 2 in temporal direction from the fovea .

  7. Eccentricity vector - Wikipedia

    en.wikipedia.org/wiki/Eccentricity_vector

    For Kepler orbits the eccentricity vector is a constant of motion. Its main use is in the analysis of almost circular orbits, as perturbing (non-Keplerian) forces on an actual orbit will cause the osculating eccentricity vector to change continuously as opposed to the eccentricity and argument of periapsis parameters for which eccentricity zero ...

  8. Laplace limit - Wikipedia

    en.wikipedia.org/wiki/Laplace_limit

    In mathematics, the Laplace limit is the maximum value of the eccentricity for which a solution to Kepler's equation, in terms of a power series in the eccentricity, converges. It is approximately 0.66274 34193 49181 58097 47420 97109 25290.

  9. Hyperbola - Wikipedia

    en.wikipedia.org/wiki/Hyperbola

    For this case, the linear eccentricity is =, the eccentricity = and the semi-latus rectum =. The graph of the equation y = 1 / x {\displaystyle y=1/x} is a rectangular hyperbola. Parametric representation with hyperbolic sine/cosine