ANY CALCULATOR DECLINING VERTICAL SUNDIAL CALCULATOR |
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Quick start:-
To calculate the shadow angles for a direct south facing wall dial fill in the boxes in the blue panel as follows. Latitude:-Your latitude in decimal degrees, eg for New York enter 40.71 Wall angle:-Enter 90 Length BC:-Enter 1 Declination:-Enter 0 Hour angle:-Hour angle in decimal degrees. One hour =15 for 11am and 1pm shadow angle, 30 for 10am and 2pm shadow angle etc. The Calculated shadow angle appears in the yellow panel after clicking the calculate button. |
LATITUDE... In the US your angle of latitude can be found Here . The angle needs converting from degrees, minutes and seconds to decimal degrees, eg 52� 30' would become 52.5 WALL ANGLE... LENGTH BC...This is the vertical length of the gnomon where it joins the wall. DECLINATION...The range is 23.44 for the sun's highest point in the summer, to -23.44 for the mid winter sun. The equinoxes have a declination of 0. On the dial, the lines of declination across the dial face are tracked by the shadow from the end of the gnomon, point `A', this shows as the tip of the shadow at point `F'. HOUR ANGLE...One hour is represented by 15 degrees, (360/24). Multiples of 15 up to 90 represent the range of hours on one side of the the dial. West face and east face being calculated separately except when the wall angle is 90. Any fractions of angles can be calculated. GNOMON... SHADOW... LONGITUDE... |