[hakken306]

In space, there is only direct sunlight. On Earth, you have to consider illumination from the whole sky.

On Earth, the sun's disc at noon appears yellow-ish due to being white minus some blue light scattered away by the atmosphere. But there is also the rest of the sky illuminating the ground, as you can still easily see in shadowed areas. That is blue light from the sky hemisphere.

It very approximately adds back up to white overall for something exposed to direct sun and the whole sky, depending on the sun's position in the sky.