After spring break, I noticed some changes due to the changing of the sun angle and because of daylight savings time. Before spring break, at 2pm the sun entered the space and cast light on the wall and on the stair landing. After the time change over the break, the sun did not cast light in the space at all at 2pm, but sometime between 2 and 3pm.
Before daylight savings time: Feb 25 at 2pm
After daylight savings time: April 9 at 2pm
April 24 at 2pm