The transition of time between night and sunrise (morning twilight). Time and Date
Vertical angular distance between the center of the celestial body and the celestial equator. Wikipedia.
Distance to subject
Distance between focal point of the target and the subject to be photographed.
Distance to the horizon
Distance between a point on the surface or place on Earth and the apparent line between the sky and the earth (or body of water). Wikipedia.
Duration of the day
Number of hours of daylight, measured since the sun begins to peek over the horizon and the moment it disappears from the horizon. Wikipedia.
The transition of time between sunset and night (afternoon twilight). Time and Date