How to calculate the angle of incidence of a projectile (taking into account air resistance)?

Question

Physics

Is it possible to calculate the angle of incidence of a projectile flying along a ballistic trajectory? (angle, at the moment of meeting with the ground)
The shot and the fall of the projectile occur on the same horizontal plane.
In principle, the general formula is of interest, but the specific case is this:

https://planetcalc.ru/1508/
https://youtu.be/Nd8bq1F3d8I?t=176
Upd: Air must be taken into account.

Answer 1

The angle of incidence is equal to the angle of reflection. Ugh: the angle at the moment of meeting with the earth is equal to the angle at the moment of parting with the earth.