| Description: | From installation, the shadowband was positioned south at solar noon until the vernal
equinox when it began to migrate counter-clockwise until reaching east 37 days later on 4/26
(about 9 days before mid-spring). The shadowband at solar noon continued to migrate until
reaching its most northerly position (~15 deg) on the summer solstice (if everything was
perfectly aligned, it probably would have been pointed north on this day). It then began
to migrate clockwise and reached east again 56 days later on 8/16 (about 14 days after
mid-summer). As expected, the shadowband reached its most southerly position on the
autumnal equinox but was about 10 deg off of being due south.
With the apparent alignment problem, I don't understand why the shadowband was mostly
blocking the sun. When I started noticing this offset in May, I chose to leave it alone
because I felt that adjusting the shadowband to where I thought it should be would cause it to
not block the sun at either sunrise or sunset.
The alignment was corrected on 9/29 (6 days after the day of the autumnal equinox). |