[Begin transcript.]
Upper-Left Side
On this equatorial sundial read the right edge of shadow in a.m.; the left edge of shadow in p.m. Then add or subtract number of minutes shown on chart below for current date. The result will be Standard Time in Medicine Hat. For Daylight Savings [sic] Time subtract [sic] one hour.

Upper-Right Side
Watches in Medicine Hat are set at average Solar Time of the Sun's passage over the 105° meridian (7 hours west of Greenwich, England) 240 miles east of here. The 22.8 minute time difference between here, 110°42'5" east [sic] longitude and 105° east [sic] longitude is corrected for in the dial. Further daily correction to watch time is shown in this analemma [sic]. The granite dial parallels the Equator and the steel gnomon parallels the north-south polar axis.
[End transcript.]

[Editorial Commentary: For Daylight Saving Time (MDT), add one hour to Solar Time. Note that both Medicine Hat (110°42'5"W) and the Standard Time Meridian for the Mountain Time Zone (105°W) are in fact located in the Western Hemisphere. The so-called "analemma" is more correctly referred to as a graph of the Equation of Time.]

Note: The Equation of Time graphs also show the Zodiac (upper x-axis), the band of constellations through which the Sun, Moon, and planets move in the course of a year. Remember that signs of the Zodiac are "Sun signs," meaning that they appear in the day sky on your birthdate (the Sun is "in" your sign).

• The Medicine Hat Equatorial Sundial, a reverse cache by Lil'Romers
• The Boulder, CO Equatorial Sundial, University of Colorado
• The St. Petersburg, FL Equatorial Sundial, War Veterans' Memorial Park
• The Frankenmuth, MI Equatorial Sundial, Memorial Park
• The equatorial sundials of the Erickson Memorial Company, Sundial Division
• SCSA Educator's Guide to Equatorial Sundials