### NatLon

Native longitude of the reference point of a FITS-WCS projection

#### Description:

This attribute gives the longitude of the reference point of the FITS-WCS projection implemented by a WcsMap. The value is in radians in the " native spherical" coordinate system, and will usually be zero. See the description of attribute NatLat for further information.

Type:

#### Applicability

##### WcsMap
All WcsMaps have this attribute.