The ruling on fasting for one who broke his fast before Maghrib due to a mistaken estimation of the time

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: We traveled from Makkah to al-Madinah in the month of Ramadan, and there are many mountains on the road, so we could not see the sun. He says: So I checked my phone for the time of Maghrib in al-Madinah, because we were close to it, about eighty kilometers away. So we calculated the time and broke our fast, but after five minutes we passed a mosque on the road and found that the adhan for the Maghrib prayer had not been called yet. He says: Is our fast valid, or what must we do?

Answer:
If you broke your fast before the sun set, you must make up the fast, because you did not complete the day. Allah the Exalted and Majestic said: . So if you are certain that you broke your fast before the sun set, you must make it up. Eighty kilometers, there may be a time difference; eighty kilometers is far. Yes.