Declination Analysis
As part of the ArborShadow Accuracy Tests.
For this test I picked 6 sites (see following table) with a different date and time setting for each (the correct time difference and daylight saving time was applied where necessary).
For this test I picked 6 sites (see following table) with a different date and time setting for each (the correct time difference and daylight saving time was applied where necessary).
The ArborShadow calculation for the sun's declination was then compared against 3 other on-line sun position calculation tools. See results below:
The actual difference between the ArborShadow value and each of the other calculation tools was then calculated and displayed as a graph (see below).
The difference for each sample is very small (less than 0.1 degree).
