What classifies sunrise?When we have daylight or when you can see the sun on the horizon?

Answer 1

Good question. It's the sort of thing that seems so obvious -- but everyone has a different opinion about just what the correct answer is. In some parts of the world, sunrise happens when you can distinguish between a black thread and a white one - in other words, when the day begins to become light. In other places it isn't until the sun is actually on the horizon. It's pretty spectacular to watch the sun rise in the Grand Canyon -- it literally runs down the walls of the canyon, revealing things you never see at any other time of day, until it hits the bottom of the canyon.
The actual definition must have to do with daylight, because if it were when we saw the sun on the horizon, that means there would never be a sunrise on a cloudy or rainy day.
'But that's just my opinion.

Answer 2

It is when the upper part of the Sun's disk touches the horizon, which is the same as saying sunrise is when the first part of the sun peeks above the horizon and sunset is when the last part disappears below the horizon. Of course it is the theoretical horizon, usually not seen clearly except on a calm sea.

Answer 3

When you see the sun peep on the horizon; that is sunrise

Answer 4

When the sun begins to appear over the horizon, at sea level, if there are no hills in the way.

Answer 5

Weather Underground has a glossary of such terms. The navy has some more technical definitions.

Answer 6

No, it is first light. As in, "We ride at first light." That is what first light means, so it is the same.