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Geometry of Gregorian Telescope

​
a
b
p
ray
eyepiece
foci
photo
This Demonstration shows the principle of a telescope designed by the Scottish mathematician and astronomer James Gregory in the seventeenth century; it was first built in 1673 by Robert Hooke. The parameters
a
and
b
are the semiaxes of the ellipse, and the equation of the parabola in polar coordinates is
r=p/(1-cos(ϕ))
The ellipse and parabola have a common focus.

Details

For the construction of a Gregorian telescope see[1].
The photo was taken from[2, p. 94].

References

[1] Wikipedia. "Gregorian Telescope." (Nov 29, 2016) en.wikipedia.org/wiki/Gregorian_telescope.
[2] J. Gregory, Optica Promota, London: Thomson, 1663. books.google.com.mx/books/about/Optica_promota.html?id=W2U_AAAAcAAJ.
[4] I. Bruce. "James Gregory's Optica Promota." (Nov 29, 2016) www .17centurymaths.com/contents/James%20 Gregory/Prop1OP.pdf.

External Links

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