ObsLon - The geodetic longitude of the observer (SpecFrames  only)

Description:

This attribute specifies the geodetic (or equivalently, geocentric) longitude of the observer, in degrees, measured positive eastwards. See also attribute ObsLat. The default value is zero.

The value is stored internally in radians, but is converted to and from a degrees string for access. Some example input formats are: "155:19:23.2", "155 19 23.2", "155:19.387", "155.32311", "E155.32311", "-204.67689", "W204.67689". As indicated, the sign of the longitude can optionally be indicated using characters "E" and "W" in place of the usual "$+$ " and "-". When converting the stored value to a string, the format "[s]ddd:mm:ss.s" is used, when "[s]" is "E" or "W" and the numerical value is chosen to be less than 180 degrees.

Type:

String.