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EarthDial Calculator

Enter your latitude below, then click on the "Calculate!" button. The EarthDial Calculator will calculate all of the angles and distances that you need to construct the lines on your EarthDial.

To find your latitude and longitude, consult a good map or visit:

CAUTION: This table will not work well for latitudes smaller than 4 degrees. Instead, use the near-equator calculator for EarthDials located close to the equator (less than 14 deg).

Enter your latitude in degrees
(positive values only):

Enter gnomon height in centimeters
(positive values only):

Distance CG: cm
Recommended minimum dial plate radius: cm
Hour Line Angles B
12 noon:
degrees
11 am, 1 pm:
degrees
10 am, 2 pm:
degrees
9 am, 3 pm:
degrees
8 am, 4 pm:
degrees
7 am, 5 pm:
degrees
6 am, 6 pm:
degrees

Date Curve Points
Distance CS Distance CE Distance CW
12 noon:
cm cm cm
11 am, 1 pm:
cm cm cm
10 am, 2 pm:
cm cm cm
9 am, 3 pm:
cm cm cm
8 am, 4 pm:
cm cm cm
7 am, 5 pm:
cm cm cm
6 am, 6 pm:
cm cm cm
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