It is the time of Athan of Fajr!

I have a question concerning the the time when suhoor time ends. Allah says in the quran “and eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night)” [al-Baqarah 2:187]. Practically we are unable to say when this dawn breaks. is it the time of fajr? does fajr starts with this dawn?

Fasting |