Time for Subh (Fajr)
The time for Subh starts from dawn until sunrise. Dawn is a bit bright white light that spreads in emerging eastern horizon shortly before sunrise. There are two kinds of dawn, i.e. the "kadzib" dawn and "shadiq" dawn. The kadzib dawn is the lie-dawn, as the name suggests. The kadzib dawn is when little bright light stretching and pointing up in the middle of the sky during the early hours in the morning. The shape of the bright light is like the tail of wolf. After a little while, then the sky became dark again.
While the second dawn is shadiq dawn, which is really the dawn of a rather bright white light that spreads in emerging eastern horizon shortly before sunrise. Dawn marks the entry of Fajr time. A few moments after shadiq dawn, then the sun will rise which signifies the end of Fajr time. Thus, the time between shadiq dawn and sunrise is the time for Subh (Fajr) prayer.