Sunrise is officially defined as the moment when the (top edge) of the Sun first appears on the horizon. However, the exact time this occurs is not a fixed universal constant; it is a moving target that shifts every day based on where you are on Earth and the time of year. The Mechanics of Sunrise Time
Begins when the sun is 6° below the horizon. This is when there is enough light to see clearly without artificial lamps. what time is sunrise
For scientific and navigational purposes, sunrise is calculated to occur when the center of the Sun is geometrically from the zenith (straight up). This specific angle accounts for: Sunrise is officially defined as the moment when
Because we measure from the center but "see" the top edge first. what time is sunrise