Data Providers: Satellite: 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.

Name	Description
Sunlight	Periods when object is in full sun.
Penumbra	Periods when the object is in partial shadow. Also means that part of the solar disk is occultated.
Umbra	Periods when the object is in total shadow. Also means that the Sun is seen as entirely obscured.
Subpoint Sunlight	Periods when the detic sub-point of the object is in full sun. The detic sub-point of an object is defined as the point on the reference surface of the central body whose surface normal passes through the position of the object.
Subpoint Penumbra	Periods when the detic sub-point of the object is in partial shadow. Also means that part of the solar disk is occultated. The detic sub-point of an object is defined as the point on the reference surface of the central body whose surface normal passes through the position of the object.
Subpoint Umbra	Periods when the detic sub-point of the object is in total shadow. Also means that the Sun is seen as entirely obscured. The detic sub-point of an object is defined as the point on the reference surface of the central body whose surface normal passes through the position of the object.

Name

Description

Sunlight

Periods when object is in full sun.

Penumbra

Periods when the object is in partial shadow. Also means that part of the solar disk is occultated.

Umbra

Periods when the object is in total shadow. Also means that the Sun is seen as entirely obscured.

Subpoint Sunlight

Periods when the detic sub-point of the object is in full sun. The detic sub-point of an object is defined as the point on the reference surface of the central body whose surface normal passes through the position of the object.

Subpoint Penumbra

Periods when the detic sub-point of the object is in partial shadow. Also means that part of the solar disk is occultated. The detic sub-point of an object is defined as the point on the reference surface of the central body whose surface normal passes through the position of the object.

Subpoint Umbra

Periods when the detic sub-point of the object is in total shadow. Also means that the Sun is seen as entirely obscured. The detic sub-point of an object is defined as the point on the reference surface of the central body whose surface normal passes through the position of the object.