The Preconditions of Acceptance

You can't fast a day saying it's probably Ramadan. You must be certain and that certainty is derived by two ways. Either Shabbat reaches 30 night, 30 days, which you know that the history month will never be 31 days. So therefore Ramadan must be the next night or the moon was witnessed. And we go by anywhere in the globe. If you want to say it with your tongue just for the sake of it, you can, there's nothing stopping you, but you're not obligated to. In your heart, you made the intention. When do I need to renew my intention? Do it enough for the whole month? The only time that doesn't happen is if