The innovation of the unified adhan and its transmission from Shaykh Taqi al-Din al-Hilali and others that the Fajr adhan is called before its time.

The Shaykh : I hear with my own ears the adhan that is broadcast from a single mosque there. Among the innovations of this country, which it has uniquely adopted unlike other countries—and praise be to Allah, it has uniquely adopted it because it is an innovation—is that the adhan there is called the "unified adhan." It is broadcast on the radio so that everyone, near and far, hears it at the same time in all the mosques. Knowing that in Oman—I do not know if some of you have been there—some houses are in valleys, some on the tops of mountains, and some on the peaks of mountains. And these mountains vary in height and elevation. In such a town, first of all, it is impossible for the time to be the same; the time for one who is on the mountain is different from the one in the valley between the mountains, in any time, except rarely. The point is that we hear the Fajr adhan, and then... about half an hour later we see the true dawn and hear the iqamah from the mosque near us at the exact time of the dawn. So the sunnah prayers they perform before Fajr necessarily occurred before the time of Fajr. As for the obligatory prayer, in the mosque near me it takes place, praise be to Allah, at the first time. But in the other mosques, they have already finished. Yes, that is right. Likewise, in Syria, we hear the broadcast while we are eating suhur in Amman, and they have already prayed Fajr and started the songs they call religious songs. This is regarding Fajr. As for the Maghrib adhan, I see the sun has set behind the mountain, and I am in... do you see when it set? The sun set for those in the middle of Oman, meaning in the valley, a long time ago. Nevertheless, I see the sun, and I am on a high mountain, and it has set ten minutes later, and they call the adhan for Maghrib. The timing is not... at all. Then I learned some of what I learned from written, printed messages, and some from the news I heard, that in Kuwait they also call the Fajr adhan before the dawn by about a third of an hour. In Maghrib as well, Shaykh Taqi al-Din al-Hilali, who was a teacher at the Islamic University, has a treatise in which he states that they also call the Fajr prayer before its time by this amount. So I advise you to observe the dawn in your area, because I tried in some countries where it was facilitated for me. Once, I climbed a high building in al-Madinah al-Munawwarah in the month of Ramadan, I think two years ago, and we were fasting. The sun set behind it, and I broke my fast ten minutes later, and the mu'adhdhin called the adhan. And this is a digression, and though it is long, it has a benefit. My previous answer was that the time of dislike before the adhan of Dhuhr is about ten minutes or a quarter of an hour at most. But this is on the assumption that they call the adhan at the Shari'ah time, not at the astronomical time.