San Francisco Sundials
Ingleside Terraces sundial, aerial view San Francisco sundial, aerial view
The Ingleside Terraces Sundial on Entrada Court was built at the at the time of the original development of Ingleside Terraces. The gnomon is 28'4" long. As evidenced by the plaque at its base, it was dedicated on October 10, 1913, the same day as the "meeting of the waters" in the Panama Canal. This sundial is located in Hilltop Park in the Bayview District of San Francisco. The steel gnomon is 78 feet long. More information about San Francisco sundials is found at

How to tell time with the Ingleside Terraces sundial:
Ingleside Terraces sundial suntime
10:00 suntime, 10:00 PST Dec 2
The first week of December, suntime and clock time are the same (within a minute) in Ingleside Terraces.
Ingleside Terraces sundial suntime
11:36 suntime, 12:00 PST Feb 11
In February, suntime is up to 24 minutes behind Pacific Standard Time in Ingleside Terraces.

12:00 suntime, 13:11 PDT Jun 20
Summer solstice, shortest shadow of the year.

Doesn't work if it's foggy.

16:15 suntime, 17:07 PDT Nov 1
Note the use of the Roman Numeral IIII instead of IV.
Use the shadow to the left in the morning, to the right in the afternoon, and the center at noon.
Right click the images to view larger images and the 15' and 30' time markings in the concrete.
Solar Noon, 12:00 on a sundial, occurs in San Francisco at the following local times (for the 21st of each month, 2015):
January 12:22 PSTApril 13:09 PDTJuly 13:16 PDTOctober 12:54 PDT
February 12:24 PSTMay 13:07 PDTAugust 13:13 PDTNovember 11:56 PST
March 13:18 PDTJune 13:12 PDTSeptember 13:03 PDTDecember 12:08 PST
The Ingleside Terraces sundial time and clock time are the same (within a minute) from December 2 to 5.
Ingleside Terraces sundial 10/18
photo October, 2018
  Sundials in the northern hemisphere point north and the angle of the gnomon is equal to the latitude (37.7 degrees for the Ingleside Terraces Sundial), so that the gnomon is parallel to the earth's axis. The gnomon always points to Polaris, the North Star. If you stand next to the Ingleside Terraces Sundial at night and look up the gnomon, you will see Polaris.
  Sundials in the southern hemisphere point south and the shadow of the gnomon rotates counterclockwise during the day.
[+] How to convert from sundial time to clock time:
[+] Sundial Bridge, Redding, CA:
Ingleside Terraces sundial, enhanced aerial view
Ingleside Terraces Sundial Centennial 2013
Ingleside Terraces sundial, winter solstice
Ingleside Terraces Sundial winter solstice 2013
Longest shadow of the year at noon.

Ingleside Terraces Sundial links:
Google map, directions to the Sundial
Ingleside Terraces Sundial, Then and Now Photos
Ingleside Terraces Giant Sundial
Kite Aerial Photographs
Sundial History

Creative Commons License
Robert Karis