the angle between the hour circle passing through a given body, and the meridian of a place.
Hour circle
Any circle of the sphere passing through the two poles of the equator; esp., one of the circles drawn on an artificial globe through the poles, and dividing the equator into spaces of 15°, or one hour, each.
Hour hand
the hand or index which shows the hour on a timepiece.
Hour line
A line indicating the hour.
Hour plate
the plate of a timepiece on which the hours are marked; the dial.
Sidereal hour
the twenty-fourth part of a sidereal day.
Solar hour
the twenty-fourth part of a solar day.
The small hours
the early hours of the morning, as one o'clock, two o'clock, etc.