The first appearance of the sun above the horizon in the morning; more generally, the time of such appearance, whether in fair or cloudy weather; as, to begin work at sunrise
The event or time of the daily first appearance of the sun above the eastern horizon
The daily appearance of the sun on the eastern horizon as a result of the earth's rotation In the United States, it is considered as that instant when the upper edge of the sun appears on the sea level horizon In Great Britain, the center of the sun's disk is used instead Time of sunrise is calculated for mean sea level
{i} rising of the sun; dawn, time of day when the sun rises above the horizon; beginning, emergence
The time when the upper limb of the sun appears above the sensible horizon as a result of the diurnal rotation of the earth (no adjustment made for elevation of observer or atmospheric refraction)