Aim a solargraph can for your site and dates. Near the equator the noon Sun crosses overhead, so the planner picks the bore direction and paper altitude.
Frequently asked questions
Which way should a Guyana can face?
It depends on the dates. At 6.8°N the noon Sun is north of overhead from about 7 April to 4 September, so a can exposed then faces north; from October to February it faces south. For exposures that span both, the planner compares the aims and keeps the one that fills the paper.
How long should I leave it?
Weeks to months. Pair this planner with the pinhole simulator to preview trail density.