Answer:
The inclination angle will depend on the season
Explanation:
On summer, the sun will be exactly in the top of the celestial sphere, that means, is going to be on 0º.
As the Earth starts to move into their orbit, by the tilt of our planet, the relative position of the sun trough the season, is going to be different, for example, during Autumn is going to be a little bit inclined from the top, at 23.5 º, that is the reason, why the days start to be shorter.
Later during winter, the grades of inclination increases another 23.5 º, giving even shorter days because the sun it will hit the surface just few degrees, just few hours.
When Spring arrives, then the cycle start to be in the other way, the sun will gain 23.5 º, that means, that is closer to be at the top of the celestial sphere, so again, days are longer, because the angle of illumination of the sun is bigger.
Until the Earth again, reaches the summer, the cycle start again.
Hope this info is useful.
