Final answer:
The subject of this question is Physics. The question is asking about changes in daylight hours in a certain city in France after the spring and autumn equinoxes. The changes in daylight are due to the tilt of Earth's axis of rotation and its orbit around the Sun.
Step-by-step explanation:
The subject of this question is Physics. Physics is the branch of science that studies matter, energy, and the interactions between them. It deals with concepts such as light, motion, and the physical properties of objects.
In this case, the question is asking about the changes in daylight hours in a certain city in France after the spring and autumn equinoxes. These changes in daylight are due to the tilt of Earth's axis of rotation and its orbit around the Sun.
Using this information, we can explain the increase and decrease of daylight hours in the city throughout the year based on the position of the Sun relative to the celestial equator.