WHEN TO BREAK THE FAST H 1262 "When the evening approaches from this side (east) and the day retreats from this side (west) and the sun has set, the one who is fasting breaks his fast." R 1262 Bukhari and Muslim with a chain up to Omar the son of Khattab who related that the Messenger of Allah, praise and peace be upon him, said this.
1236- وعن عمر بن الخطاب رضي الله عنه ، قَالَ : قَالَ رسولُ الله صلى الله عليه وآله وسلم : "إِذَا أقْبَلَ اللَّيْلُ مِنْ هاهُنَا ، وَأدْبَرَ النهارُ مِنْ هَاهُنَا ، وَغَرَبَتِ الشَّمْسُ ، فَقَدْ أفْطَر الصَّائِمُ" متفقٌ عَلَيْهِ .