pyarts3.arts.path.geometric_tangent_zenith

path.geometric_tangent_zenith(pos: pyarts3.arts.Vector3, ell: pyarts3.arts.Vector2, alt: float, aa: float = 0.0) → float

Get the zenith angle at position for radiation passing the limb altitude

Note

An observer at the position pos looking at the horizon will have a line of sight that is the mirror of [za, aa].

Parameters:

  • pos (Vector3) – Position vector [alt, lat, lon].

  • ell (Vector2) – Ellipsoid parameters (semi-major axis, semi-minor axis).

  • alt (Numeric) – Altitude above the ellipsoid.

  • aa (Numeric, optional) – Azimuth angle in radians. Defaults to 0.0.

Returns:

za – Geometric tangent zenith angle in radians.

Return type:

Numeric