One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds).
The rotational period of Earth; the time in which Earth rotates around its axis 360 degrees.
The time of day when the sun appears above the eastern horizon.
Any great awakening.
The change in color of the sky at dawn.