Standard Time Correction Chart

This chart "corrects" for the two sources of "error" when reading the sundial (actually, these are adjustments to correct for the errors inherent in your watch!). This sundial almost always "runs fast" when compared to your watch.

This chart tells you the difference between Sundial Time and Central Standard Time (the time on an accurate clock or watch) for any day of the year. Determine the day and month, and read the time correction for that day. Most of the numbers have a negative (-) sign in front of them. That means that Central Standard Time (on your watch, clock, or phone, if it is accurate), will be behind (slower) than what the Sundial reads. So you must subtract the amount of time from the time shown on the sundial to get the correct Central Standard Time (only on a few days, from February 6th to 18th, does the sundial read slow, but only a few seconds, so it will not be noticeable on the dial). It might be easier to think of this negative number as how "fast" the dial is compared to your watch.

A Note on Daylight Savings Time
If you are on Daylight Savings Time, you must ADD an hour to your corrected Sundial time to get the same time as your watch. Sundials refuse to acknowledge Daylight Savings Time.

Click here to access the chart.


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