condition mean min max 4 h after light 7.8469 7.713769999999999 8.05305 8 h after light 7.821423333333334 7.569189999999999 8.029110000000001 12 h after light 7.94753 7.652830000000001 8.12969 4 h after dark 7.640063333333333 7.34277 7.84437 8 h after dark 7.570093333333333 7.407260000000001 7.71974 12 h after dark 7.569983333333334 7.498530000000001 7.657830000000001