This attribute is a boolean value which controls how longitude values are normalized for display by AST_NORM.

If the NegLon attribute is zero, then normalized longitude values will be in the range zero to 2.pi. If NegLon is non-zero, then normalized longitude values will be in the range -pi to pi.

The default value depends on the current value of the SkyRefIs attribute, If SkyRefIs has a value of " Origin" , then the default for NegLon is one, otherwise the default is zero.

SkyFrame