Each { name, lon } advanced by arc degrees, normalized to [0, 360). At most 256 rows with unique nonempty names and finite longitudes, and a finite arc; anything else throws RangeError. Frozen.
{ name, lon }
arc
Each
{ name, lon }advanced byarcdegrees, normalized to [0, 360). At most 256 rows with unique nonempty names and finite longitudes, and a finite arc; anything else throws RangeError. Frozen.