The appearance of the illuminated surface of a celestial body as seen from the earth.

A sleep disturbance of the circadian rhythm, sometimes learned, characterized b a pattern of going to sleep very early a night and waking up very early in the morning.

The period (as opposed to the statary phase) in the activity cycle of an army ant colony during which the colony forages more actively for food and moves frequently from one bivouac site to another.

At this time the queen does not lay eggs, and the bulk of the brood is in the larval stage.

The period (as opposed to the nomadic phase) in the activity cycle of an army ant colony during which the colony is relatively quiescent and does not move from site to site.

At this time the queen lays the eggs and the bulk of the brood is in the egg and pupal states.