The secret: On October 10, 1913, fifteen hundred people attended the opening ceremony for this twenty-eight-foot marble and concrete gnomon. It was to become the focal point of its own park and Ingleside Terraces. Oddly, the party for this sun-dependent clock was conducted at night. The timing had various symbolic reasons. That day the Atlantic and Pacific oceans kissed for the first time at the Panama Canal. It celebrated the planned opening of San Francisco's Twin Peaks Tunnel, whose fast, reliable, and clean streetcar line was designed to serve people living away from the downtown area. And it was a romantic setting that would appeal to any young couple considering a new house. - Hamilton Barrett.
The sundial still stands today in the middle of the housing development. There is no plaque surrounding it to give the history, but the links provided give first-hand experiences with the sundial, which give a history.