I've added a new feature to area pages with details about sun and shade on a crag. It appears on "leaf" areas (those areas that contain routes) and not on "branch" areas (those areas that contain sub-areas).
There area a few components:
a mathematically calculated set of arrows that show the sun angle throughout the day (click that to get a more details, and to be able to change the date and location).
a human-entered set compass directions and hours that indicate the sunny hours during the area's most popular climbing season.
any details that make sense for an area (trees? deep canyon? etc).