Peters last picture is of a miniature meridian line, and yes it is in a way a sundial, but it does NOT show time, it shows the DATE and it shows when it is noon
Meridian lines are quite common in European cathedrals, on a one week trip through Italy last year I saw about a dozen of them.
They work like this: Somewhere high up on the roof or in a wall there is a small hole. Exactly south of that hole on the oposing wall (or on the floor) is the figure shown on the picture (called an enemela). When the sunspot crosses the center line it is noon. but h0w far up the line the sunspot crosses indicates the date. Depending on the geometry of the building some meridian lines are accurate to within a day Some noon lines run for hundreds of feet all the way across a church floor.. The illustrated instrument just has a small gnomen with a hole very close to the ( very short) noon line.
The best english language book on meridian lines is:
# Title: Sun in the Church
SubTitle: Cathedrals as solar observatories
# Author: J.L. Heilbronn
# Publisher: Harvard University Press
Other Keywords: meridian meridiane easter enemela suncalendar
ISBN: 0 674 85433 0 -- Library of Congress: QB29.H33 1999 99-23123 -- Dewey: 520'.94-dc21
Notes: Probably the most comprehensive english language book on the subject of meridian lines and solar calendars, countless illutrations, index, bibliography, scholarly text but quite accessible.
Edition: 1999, 1st edition -- Copyright: 1999
Geographic area: Italy
Pages: 366 -- Height in cm: 25
Print Status: 1 (1 means in print - 2 means out of print)
BHM ID: 443
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Publisher, Bibliographia Horologiae Mundi
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