I searched and found many articles pertaining to my questions, but I couldn't conclude a satisfactory answer regarding my issues. I request the readers to provide me answer/s from Quran and Sunnah
1. Prior to Ramadan, Fajar Salat in mosque was offered just before the dawn breaks and after we leave the mosque (after praying), we can see that darkness has vanished (not completely but with 100% clear distinction)
2. Now since the start of Ramadan, The Siren to End the Suhoor is given at 5-10 minutes before Fajar Azaan and Fajar Salat in mosque is offered after 5 minutes of Azaan. In total, the Fajar Salat is offered half and hour before the time it use to be done in normal days (non-ramadan months)
3. Now, why it is so ? Because even after offering the Fajar Salah, it still dark and you can't see anywhere even a streak of light, what about this verse ...eat and drink until the white thread of dawn appear to you distinct from its black thread;... - 2.187
4. How come we have two different Fajar times ?
5. Then we have the Hadith "When the above verses were revealed: "Until the white thread appears to you, distinct from the black thread,"I took two (hair) strings, one black and the other white, and kept them under my pillow and went on looking at them throughout the night but could not make anything out of it. So, the next morning I went to Allah's Apostle and told him the whole story. He explained to me, "That verse means the darkness of the night and the whiteness of the dawn." - Sahi Bukhari Vol 3 Hadith No.140
6. From Fiqh-Sunnah The time for the pre-dawn meal is between the middle of the night and dawn. It is considered best to delay it (that is, as close to dawn a possible). Zaid ibn Thabit reported: "We ate the pre-dawn meal with the Messenger of Allah and then we got up for the prayer. He was asked: 'What was the amount of time between the two?' He responded: '[The time it would take to recite] fifty verses.' " This is recounted by al-Bukhari and Muslim.
'Amr ibn Maimun adds: "The companions of Muhammad, upon whom be peace, would be the first to break the fast and the last to eat their pre-dawn meals." This is recorded by al-Baihaqi with a sahih chain.
7. Now the above Hadith is very clear and it points it to the time between Azaan of Fajar and actual starting of the salat in mosque (calculating that the time taken to read 50 verses is 15 mins and this is difference of time between Azaan and Salaat) but the question remains same that did Prophet also had 2 different timings for Fajar in Ramadan and Non-Ramadan days ?
8. If in normal days, Fajar Azaan was at 5.15 am and Jamat was standing at 5.25 AM, then Suhoor time ends at 5.15 AM but now we have different situation. Suhoor ending siren rings at 4.35, Fajar Azaan is at 4.45 and Fajar Jamaat is at 4.55 (or 4.50). ?
9. There is difference in time of Dawn and Sunrise. As per this site http://www.islamicity.com/prayerTime...Delhi%2C+India
Dawn is at 4.40 and Sunrise is at 6.01. I don't know this dawn is being calculated but at 4:40 is still dark. Yet, 6.01 is too late. The approx where light can be seen is somewhere in between this time.