Thanks for writing. "Part sun" is kind of a tricky one because it means a lot of things. Essentially, you can consider part sun to mean the area gets at least a couple of hours of direct sun a day, but less than 6 hours of direct sun.
If it's bright, filtered light all day, it could be part sun, but it's more likely shade, though many part-sun plants may do well in those conditions.
---Justin, Senior Garden Editor, BHG.com