UnitSphericalValue - AnalyticalGraphicsInc/czml-writer GitHub Wiki
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A unit spherical value specified as [Clock, Cone] angles. The clock angle is measured in the XY plane from the positive X axis toward the positive Y axis. The cone angle is the angle from the positive Z axis toward the negative Z axis. If the array has two elements, the value is constant. If it has three or more elements, they are time-tagged samples arranged as [Time, Clock, Cone, Time, Clock, Cone, ...], where Time is an ISO 8601 date and time string or seconds since epoch.
Type: array