I'm taking a photo of the setting sun, and want to capture the color of the sun accurately and objectively.
If we're talking about reflected right, I understand that the camera can't distinguish between yellow light bouncing off a white wall, and white light bouncing off a yellow wall. Therefore, white balance is a subjective game.
But when we're talking about incident light, it should be possible to objectively and accurately measure the color temperature of the sun — the average frequency of its spectrum. Is that reasoning correct? If so, how do I accurately capture the color of the setting sun itself?
The goal is that the color of the sun in the photo should be exactly the same as it was in real life, assuming I'm viewing it on a calibrated monitor. I often find that the brilliant orangish color of the sun is replaced by a more neutral yellow (cooler temperature), destroying the effect I'm trying to capture. The goal is NOT to cancel out the color of the sunlight, say by using a gray card.