On the Clebsch Diagonal Cubic, all 27 of the complex lines present on a general smooth Cubic Surface are real. In addition, there are 10 points on the surface where three of the 27 lines meet. These points are called Eckardt points (Fischer 1986).

**References**

Fischer, G. (Ed.). *Mathematical Models from the Collections of Universities and Museums.*
Braunschweig, Germany: Vieweg, p. 11, 1986.

© 1996-9

1999-05-25