golden hour

In photography, the golden hour is the period of daytime shortly after sunrise or before sunset, during which daylight is redder and softer than when the sun is higher in the sky.

The golden hour is also sometimes called the magic hour, especially by cinematographers and photographers. During these times, the brightness of the sky matches the brightness of streetlights, signs, car headlights and lit windows.

The period of time shortly before the magic hour at sunrise, or after it at sunset, is called the "blue hour". 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 already set.

I've chosen to use it in instances when it's either sunset or sunrise but it's not clear, not fully 1:1 in it's intended usage but it's close enough.