@evegrimm , tend to have hints of the night sky in them—blues/purples, whereas sunsets are more truely red/orange/yellow.
Not at all. This is a winter sunrise shot of the sun rising out of the sea over Surfers Paradise – taken from Eagle Heights in the mountains – one that I took a few months ago. It has as much blue as a sunset. When there is fog or mist it becomes even harder – this was about the same time of day a week or two later a river dawn shot. The fog filters almost all colour out – it could be an overcast mid-afternoon.
The sun in each case is on or below the horizon, it makes little difference whether it is morning or evening. This dawn mist shot was facing away from the previous river dawn shot a few moments later. The fog & mist shots you could guess at being morning only because fog is more common around dawn than any other time of day. There are still occasional evening fogs so you can never be absolutely sure.