Gossard perspector [SEP] time of discovery
Gossard perspector
In geometry the Gossard perspector (also called the Zeeman–Gossard perspector) is a special point associated with a plane triangle. It is a triangle center and it is designated as X(402) in Clark Kimberling's Encyclopedia of Triangle Centers. The point was named "Gossard perspector" by John Conway in 1998 in honour of Harry Clinton Gossard who discovered its existence in 1916. Later it was learned
that the point had appeared in an article by Christopher Zeeman published during 1899 – 1902. From 2003 onwards the
CDE", the vertex "A" being the intersection of the Euler lines of the triangles "BFD" and "CDE", and similarly for the other two vertices. 
The triangle "ABC" is called the Gossard triangle of triangle "ABC". 
Definition Gossard perspector.
Let "ABC" be any triangle and let "ABC" be its Gossard triangle. Then the lines "AA", "BB" and "CC" are concurrent. The point of concurrence is called the "Gossard perspector