Question

what is inclination?​

Answer 1

Simply: an interest in or liking for (something).

In sentence: "She shows no inclination to give in to their demands."

Astronomical meaning of Inclination :-

The inclination of an object in the solar system (mainly) is the angle between the orbital plane of the object (planet, comet, or asteroid) and the plane of the ecliptic.

Now if somebody says, ""Cometary orbits vary widely in inclination."

Then the man is but an Astronomical fellow.