Fig. 29: It's getting dark fast near the equator. Sabang is 13.5 degrees north of the equator. This picture was taken only about a quarter of an hour later, but had to be exposed 6 times longer. — EXIF: Nikon D200; Δt=60 s; f=19 mm; f/5.6; ISO 100; 2009-11-11 12:17:14
