I feel like the search for consciousness is to psychology what the search for the Aether was for physics and chemistry. I think it is a worthwhile search, and maybe we will discover something important during that search, but we should also be prepared to find out that the thing might not exist, or it’s presumed properties are better explained with a different model.
1. take pictures of brain activity under different conditions to see which regions were active during different moods,
2. sacrifice a bunch of mice to see which neuro-chemical activated which neurons,
3. predict that inhibiting the re-uptake of a specific neuro-chemical would activate that region,
4. predict that activating that region would decrease the level of depression
In your solar example you would have discovered melanin and its relation to your skin tone, and you would have studied the effects ultra-violate radiation has on your melanin levels. Then you would have predicted that staying out of the sun will not give you a tan.
Respectfully, you are miles out of your depth here.
My point with the SSRI is that we know that serotonin is a chemical which incites certain neurons, and we know that a lack of activity of neurons in that general area in the brain is correlated with depression, so scientists were able to accurately predict that keeping the serotonin in that brain area for longer would increase brain activity there and decrease the level of depression.
This counts as pretty good understanding in my books at least. It teaches us very little about consciousness but my point is that it doesn’t have to. Just like Newton’s theory of gravity did not have to teach us about some deeper cosmological truth.
I would also argue that Newton's theory of gravity was not a pretty good understanding of gravity.