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The Caltech Alumni Association Analemmatic Sundial
What is the sundial made of?
Contrary to what you might think, the sundial is not made of granite. It is in fact Granodiorite (Muscovite-bearing biotite-granodiorite, to be exact). The rock came from Knowles Quarry, east of Raymond, California (map). The quarry is the white scar in this mapped image.
Location: 37 deg., 13' 11.25" N 119 deg., 52' 26.54" W, 283m.
Ref: Geologic Map of the Raymond Quadrangle, Madera & Mariposa Counties, CA USGS Map GQ-1555 1982
Special thanks to Caltech Professor Paul Asimow ('93 MS, '97 PhD GE) for these details.
What did the construction process entail?
See photos documenting the entire process, from etching the stone to the unveiling of the final artwork.
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