1) Opinion: "I believe it will rain tomorrow."
I'm not sure this is 100% opinion. This is more of a prediction regarding a Quantifiable-Event.
Opinions are usually based on siding with a view you favour but they could just be offering an option that you do not believe as a devil's advocate.
It could be an opinion based on the "red sky in the morning."
"In my opinion, since it is a red sky tonight it will rain tomorrow."
It rains tomorrow. What I believed and stated turned to be what corresponded to the truth.
"In my opinion, since it is a red sky tonight it will be a beautiful sunny day tomorrow."
Tomorrow turns out sunny.
An opinion would be, "I believe if it rains tomorrow it will be the most beautiful rain any human has ever seen".
Fact: It rains tomorrow.
I agree this is a fact.
HOWEVER, the prediction (that it would rain) was not FACT -until- it was verified.
In that case. Facts are what is or what is the case. A prediction is only true once the event happens. That is why biblical prophecy is so compelling. The evidence or prediction is made long before the evident happens.
Neither is an opinion known as fact until it is verified as fact. But a fact (what is the case) is true/fact whether it is verified or not.
The prediction is merely a unverified prediction (not a fact) up-to-and-until it is verified (at which point it becomes a fact).
True. Something has to be what it is to be fact. Nevertheless, my opinion about the weather, no matter how I got it, proved to be true of the fact. Not all opinions are valid.
And in the case that you believe the rain will be the most beautiful rain any human has ever seen, well, NO AMOUNT OF RAIN WILL EVER MAKE THAT STATEMENT A FACT.
It is a relative truth for someone who believes a rainy day is a beautiful day, and especially this one rainy day. Relative truth is definitely true to that person's preference/like/dislike, nature or circumstance but it is not an absolute truth (objective, universal), which applies to everyone. Relative truth is a truth that applies to an individual such as, my name is Peter, I live at this present address, in this city (this specific location), and I am 63-years-old. Truth is always true. That particular truth is true for me now, since my name is Peter, I am 63-years old and I live in this specific city, at this specific location I am typing from, which I leave undisclosed to protect myself and my family from crack-pots. The facts comply with what is the case, yet those particular facts are not true of you.
Relative truth is not the same thing as relativism. Ronald Reagan was president of the USA from January 20, 1981, to January 20, 1989. That truth is relative to a timeframe. Even though it is not true now that Ronald Reagan is president, at that period in history it was a fact and will always be so. Thus, the fact is relative to a specific time, or a specific person or persons, or both.
An absolute, objective or universal truth is a truth that applies to all people at all times in history. It corresponds to what is the case and does not depend on my belief, likes, or taste, for it to be so. For instance, I could disbelieve it, yet regardless truth is true no matter what I think.
That opinion can never be verified or validated by facts.
The verification is hard, IMO, probably impossible for anyone but the individual to know if they can. Does the person actually, truly feel this way? Will they always feel this way? Is it a time relative truth, applying to one specific rainy day, or has that person always liked/loved every rainy day (not bloody likely)?
If the person truly feels and believes that a rainy day is a beautiful day, or that specific rainy day is the most beautiful day ever (perhaps because of some event) then that could, in fact, be the case for that person, provided no day supersedes or superseded it. It would be something that could only be verified as being the case by the person who loves rainy days and/or that particular day in specific. Perhaps they recognize it as being the case on their deathbed. It would be the case if that was the way things actually are or were to them.