What are the implications of differences between countries regarding the start of Ramadan and a person traveling between them?

Question : The questioner says: We came from Egypt to perform 'Umrah and to handle matters of the 'Id days in Saudi Arabia. Ramadan began in Saudi Arabia one day after it began in Egypt, and it is likely that we will break our fast here before the factory [does]. How should the fasting be handled if it is twenty-eight days?

Answer : Yes, if a person travels to a country that differs from his own in the sighting of the moon, meaning it is earlier than his country in the sighting, and he encounters the 'Id in the country he arrived in, he breaks his fast with them. It is obligatory for him to break his fast and make up the day he missed. If the month is twenty-nine days, he has only fasted twenty-eight days, so it is obligatory for him, after the day of 'Id, to make up that day.