# References for Kepler's Laws

- A E L Davis, 'Some plane geometry from a cone: the focal distance of an ellipse at a glance',
*Mathematical Gazette*, forthcoming July 2007.

- A E L Davis, 'Kepler's Road to Damascus',
*Centaurus* 35 (1992) pp.156-157;

- A E L Davis, Kepler's unintentional ellipse - a celestial detective story,
*Mathematical Gazette* 82, no.493 (1998), p.42;

- A E L Davis: 'The Mathematics of the Area Law: Kepler's successful proof in
*Epitome Astronomiae Copernicanae* (1621)', *Archive for History of Exact Sciences* 57, 5 (2003), especially Section 6.

- Isaac Newton:
*The Mathematical Principles of Natural Philosophy*, London 1687.