Sundials - World's Oldest Clocks
North American Sundial Society
Who Are We?
Join or Renew
Join or Renew
All Things Sundial
Old and Historic Sundials
Dials of Interest
Lost - Damaged - Restored Sundials
Transits Time and Longitude
Two Worlds - One Sun
Sundials of Interest
Digital & Virtual Sundials
Earth Motion and Telling Time
Sun Transits & Eclipses
General Sundial Links
Sundials for Starters
Sawyer Dialing Prize
Draw A Sundial
Art and Literature
View All Registry
Submit a Sundial
20° 33.462' N
100° 26.062' W
This is a private dial. See below for access details.
Madero # 61
Corregidora, Qro. Mexico
A projection (or, "negative") dial using the south-facing wall and floor of the "Cosmic Room" of a "casa de campo" private cottage. The tile roof over this room contains several skylights with slits for projecting a beam of sunlight onto the wall and one skylight with a small hole to project a dot of sunlight onto the room floor.
The wall is marked with inset ceramic tiles in an arc indicating time hours by the number of dots on the hour tiles; the dots and the bar for hour five are Mayan numbers. A vertical row of tiles forms the noon line with adjacent oval tiles identifying the date by the end of the projected sun line.
Additional oval tiles show minute marks at 15 minute intervals; the projected sun line terminates at these marks on the vernal and autumnal equinoxes. The single roof hole projects a spot of light onto the floor and depicts the analemma through the course of a year.
An additional roof aperture projects a spot of sunlight when the sun is near the zenith. This spot falls on the second-story floor but passes through a hole there and falls on the first-story floor when the sun is at the zenith.
The facility is located nearby the pyramid of "El Pueblito" and by extraordinary coincidence from the roof you see the sun set on the winter solstice exactly over this pyramid.
This facility is private but viewing of the cosmic room dial can be arranged by contacting Ruben Nohuitol at firstname.lastname@example.org.
Note the Mayan number symbols for hours 1-5.
Dial designer/builder Ruben Nohuitol.
Sunset over nearby pyramid of "El Pueblito" on the winter solstice.
Projected spot on second-story floor just before zenith noon. Note hole in floor.
Projected spot passes through hole in second-story floor and falls on first-story floor at zenith noon.
Projected spot on second-story floor just after zenith noon.
Last Revised: 6/29/2013 12:16
We have 144 guests online
Newfoundland & Labrador
Prince Edward Island
District of Columbia