Answered by Shaykh Faraz Rabbani
I have unintentionaly been using the 15 deg. fajr time, and not the 18 deg. time. I was unaware that there was even a difference until today. Because of this, I have been eating well into fajr time based on 18 deg., but have been stopping before the 15 deg. time. Due to this confusion, should my previous fasts be made up, or should I go on the basis of them being accepted?
Walaikum assalam wa rahmatullahi wa barakatuh,
There is legitimate difference of opinion on this matter. While the 18 degree Fajr time is more scrupulous (and we encourage that it be followed), the later 15 degree Fajr time also has basis. As such, fasts performed following the latter do not have to be made up.
And Allah alone gives success.
Faraz Rabbani