Belfast·SPG003 Residential Design·Page 107
Natural light (or daylight)
Natural light refers to the combined skylight and sunlight available in a space, and involves the subtended angle formed when viewed from a given viewpoint.
Refers to combined skylight and sunlight Subtended angle The angle formed by something when taken from a given viewpoint.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/belfast/SPG003 Residential Design.pdf