You used the fact that the altitude of the CEQ is the same as the angle at which the Sun rises, and then you either added 23°, subtracted 23°, or did nothing to the altitude of the CEQ depending on whether it was the summer solstice, the winter solstice, or one of the equinoxes. For your participation this week, you will have to work backwards: determine the latitude of a given place on Earth, knowing that on June 21, at noon, the Sun is in the northern part of the sky at an altitude of 35°. What is the latitude of this place?