An interesting question and more interesting history.
In J. L. Heilbron's book, The Sun in the Church, page 225 he describes
why the higher hole ( and lens) was placed. It seems it was more of a
way to get a larger midsummer image so that it was as good as the
midwinter one.
An interesting
Hi Roger,
For anyone interested I found this information on "From Wikipedia, the
free encyclopedia" about to Sundial at the church with some more pic's
please scroll to the bottom under Gnomon.
https://en.wikipedia.org/wiki/Church_of_Saint-Sulpice,_Paris
Ray
On 4/3/16, Roger W. Sinnott
Dan,
I’m just guessing, but maybe the two holes and two spots are placed so that, no
matter what the Sun’s declination is, at least one of the spots will fall on a
smooth, uncluttered part of the floor.
Roger
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of
