#### Description:

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

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.

Type:

  Integer (boolean).

#### Applicability

##### SkyFrame

All SkyFrames have this attribute.
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