زاویهی ِ درکیل
Fr.: angle d'inclinaison
1) General: The angle between one plane and another, or
the angle formed by a reference axis and a given line.
2) Binary systems: The angle between the plane of the orbit and the
→ plane of the sky.
3) Rotating stars: The angle between the → equatorial plane
and the → plane of the sky.
→ angle; → inclination.