Mine (at my old house) was in full sun all day and thrived. I took cuttings to bring here and have put them in mostly sun and close to the garage to keep them from freezing. It worked but then a week ago or so, caterpillars got to them OVERNIGHT! but their on their way back after being sprayed.

Sounds interesting but other factors do effect the readings - time of day for instance. For the cost of a roll of film and processing I took a day and from my upstairs bedroom window took photos every hour from sunup to sunset, in early June and again in August as the arc of the sun does change. I then made a sketch of my yard and location of planting beds and was able to calculate hours of sunlight on each section. Some areas got only midday light, others only early am or pm and actual amount of light was considerably less than I thought. But anything that helps pick plants appropriately is very appreciated!

As far as what cultivars do best in full sun I won't make any suggestions except try and find out the parentage of the ones you want. Tenifolia parentage likes more shade. My suggestion is on you day off, go to the spot you think you want to plant in several times of that day to see exactly where the sun is. Tell your family you need time away get a book you have been wanting to read, a good drink, and a comfortable chair. Sit in the shade and watch. Depending on the season what you see will give you a good idea of sun strength in a particular spot. Early blooming flowers benefit from the sunlight and build energy before the leaves are on the trees and then go dorment until next season. Think of the sun as a large hose. Sunlight as water. Depending on the distance and angle if you spray straight down at an orange(think plant)you get everything wet except right under the overhang. From an angle part will be in bright sun, part in light spray (non-yellow light rays) and the part directly around the orange receives no water except for runoff. Perhaps someone can explain why some plants need more of the yellow spectrum than others. At the distance from the sun to earth unless directly under something all the other light waves should hit the shady side of anything.

Cant comment on Spring Frost, but I have 3 P. Orientalis Skylands and 1 P Orientalis Aureospicata. 2 of the 3 skylands are in shade as is the aureospicata. They appear to be doing fine. I planted 1 of the skylands in full sun, and while I think/hope it will be fine long term, it is browning and had some branches die this past winter. First I thought it was too much water, but now thinking it was the full sun that caused this damage as I think my shade specimen is in a wetter spot. This thread made me think about and change my mind. Only have pics of 2 of the skylands(sun, shade, planted about 50’ from each other on same date late November 2-3 years ago). I concluded the P. Orientalis can handle shade pretty well. My largest skylands (no pic) gets the least sun and other than the fact that its basically green, it looks healthy. Growth rate is noticeably slower but the tree isnt sparse and weak looking, just green. full sun skylands (pics 1-2 months ago) shade skylands (top was angled when I bought it, slower growth but looks healthy).