Goodness. What on earth are you getting so detailed about that you need to pose this question? No, on second thought, don't tell me.
There are a whole host of things that could impinge on this question such as modality, but in order to keep it simple, let's distinguish between universal and particular propositions. A particular proposition is when the subject is not taken according to its whole extension; that is, when the term is limited and restrained to some one or more of those species or individuals whose general nature it expresses.
As for there being a sky, this is a universally true proposition, as long as one is on earth. As for the proposition that the sky is blue, this is true to the person who poses it where s/he is and at the time it is posed, as long as it obtains and coheres with the facts. It isn't universally true, and there is no law of logic being violated by saying that there are conditionals for this proposition to be true. The primitive laws of mathematics and the laws of logic are true without conditionals. That the sky is blue is not.
So now, I am tired and need to go to bed. This is a true proposition, but only particularly so, not universally so. As I go to bed, you have to stay up late writing. You can decide whether you feel that this is particular or universal when you have your first cup of coffee after having no sleep.
Best, HPS
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