He is not sinful. He has left great reward.

How important are the two rakah sunnah of fajr salah? If a person sometimes skips them, is he sinful?

Prayer | February 13, 2014 7:07 pm
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There appear to be two methods of calculating Fajr timings, one being the One-Seventh of the Night method and the other being Angle-based method. I live in England and there are drastic differences for beginning of Fajr because of these methods. The one-seventh method says fajr starts at 4am while the angle-based method says it starts at 2am. Please advise what I should do as softwares are being contradictory!
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After the tashahud and salawat-e-Ibrahim in the final tashahud, is there evidence to say RABBI JA’ALNI MUQI MASAALATA WA MIN DHUIRIYATI RABBANA WA TAQABUL DUA (dua til the end), before other dua and salam?