In front of the Ontario Science Centre's building sits a 3.5m sculpture of a rail spike. We'd been there before and never noticed the 'geodetic' significance of it.
The coordinates shown on the pictures are the N°/W° on two of the faces of the huge spike. It gives honour to J. Tuzo Wilson who served as the Director General of the Ontario Science Centre from 1974-1985.
"He and his plate tectonic theory are commemorated on the
grounds outside by the Centre by a giant "immovable" spike
indicating the amount of continental drift since Wilson's birth."
(from the Wikipedia.com article on Wilson)
Wikipedia article on J. Tuzo Wilson(p)
Article on the monument at the Ontario Science Centre site(p)
Apologies for the pics - we were pressed for time and I would have like to have captured a pic of the text at the base and a more-distant shot of the whole thing. As it is, one side has the N° and another the W°. The pic of the W had my camera screen so glaring that the first part of the "79" is lost.