[4] So, the sunset which Ahadith refer to is the eye-observed sunset and not the measure/calculated one as the Islamic laws are for all times and for all people. Hence, one should adhere to the Ahadith defined Sunset criteria which will be the same for all of us. Let’s take some Ahadith to further understand to what happens if fast is opened earlier than its prescribed time and what Allah -azwj Means by the Al-Layl in the Holy Quran.
One has to repeat Fast if opened earlier than Al-Layl: عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ مُحَمَّدِ بْنِ عِيسَى بْنِ عُبَيْدٍ عَنْ يُونُسَ عَنْ أَبِي بَصِيرٍ وَ سَمَاعَةَ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) فِي قَوْمٍ صَامُوا شَهْرَ رَمَضَانَ فَغَشِيَهُمْ سَحَابٌ أَسْوَدُ عِنْدَ غُرُوبِ الشَّمْسِ فَرَأَوْا أَنَّهُ اللَّيْلُ فَأَفْطَرَ بَعْضُهُمْ ثُمَّ إِنَّ السَّحَابَ انْجَلَى فَإِذَا الشَّمْسُ قَالَ عَلَى الَّذِي أَفْطَرَ صِيَامُ ذَلِكَ الْيَوْمِ إِنَّ اللَّهَ عَزَّ وَ جَلَّ يَقُولُ أَتِمُّوا الصِّيامَ إِلَى اللَّيْلِ فَمَنْ أَكَلَ قَبْلَ أَنْ يَدْخُلَ اللَّيْلُ فَعَلَيْهِ قَضَاؤُهُ لِأَنَّهُ أَكَلَ مُتَعَمِّداً .
Ali Bin Ibrahim, from Muhammad Bin Isa Bin Ubeyd, from Yunus, from Abu Baseer and Sama’at, (It has been narrated) from Abu Abdullah -asws regarding a group of people who are Fasting the Month of Ramazan, so the black cloud overcomes them during the setting of the sun. So, they see it as being night, and some of them break the Fast. Then the clouds move away, so the sun is (still) there. He -asws said: ‘It is upon those who break (to make up for) the Fast of that day.
Allah -azwj Mighty and Majestic is Saying complete the Fast up to the night [2:187] . So, the one who eats before the entry of the night, so upon him is its making up, because he ate deliberately’.