Data Provider Groups | Data Provider Elements

Centroid Lighting Times

Generates a listing of all lighting events. Lighting events are start and end of periods of full lighting (sunlight), partial lighting (penumbra) and periods of zero lighting (umbra). Note that the Lighting Times data provider reports all computed penumbra intervals, which means that if umbra exists, then two penumbra intervals, each with its own start and stop times, is reported--one before and one after the umbra interval. So, if lighting times that start in umbra are generated, then the first reported penumbra interval corresponds to the times that follow after the first umbra, and the penumbra interval prior to the first umbra is not reported.

Available for these objects: AreaTarget

Type: Interval data.

Availability: Reports | Graphs

Data Provider Groups

Name	Description
Sunlight	Apparent direction from which sunlight arrives at the object's location.
Penumbra	Periods when the object is in partial shadow. Also means that part of the solar disk is occulted.
Umbra	Periods when the object is in total shadow. Also means that the Sun is seen as entirely obscured.

Data Provider Elements

Name	Dimension	Type	Description
Start Time	Date	Real Number or Text	Beginning of an interval.
Stop Time	Date	Real Number or Text	End of an interval.
Duration	Time	Real Number	The duration of the interval.
Obstruction	Unitless	Text	Name of the obstructing central body.