Orbit path for photography
The NPP satellite is placed in a Sun synchronous orbit, a unique path that takes the satellite over the equator at the same local time in every orbit. When NPP flies over Kenya, it is about 1:30 p.m. on the ground. When NPP reaches Gabon, about 3,000 kilometers to the west on the next orbit, it is close to 1:30 p.m. on the ground. This allows the satellite to maintain the same angle between the Earth and the Sun so that all images have similar lighting.
Image Courtesy: www.physorg.com