Before revision: This is when the sun is at a significant depth below the horizon, when residual, indirect sunlight takes on a predominantly blue shade, and there are no sharp shadows because the sun either has not risen, or has set.
After revision: alreadyThis is when the sun is at a significant depth below the horizon, when residual, indirect sunlight takes on a predominantly blue shade, and there are no sharp shadows because the sun either has not risen, or has set.