In June 2006, Xiaoming's family bought a low-rise apartment in a commercial residential area in Shanghai. June 5438 +2007 10, after the whole family moved in. Found the sun in the front row.

1. When they looked at the house, it was summer, the sun was close to the northern hemisphere, and the noon angle was infinitely close to 90, so they didn't find any problems. In winter in the northern hemisphere, the angle of sunlight hitting the northern hemisphere reaches the minimum, so it is blocked.

2. Take the shadow of the building from winter to the sun as a reference.