Salaam,
Thank you for your reply. I had read your posted article a while back but somehow missed the bit on the "gradual movement into the night". My mistake. Sorry for the trouble.
I have also now read your article on the start of the fast.
Based on your articles I conclude the following, and also have the following new questions.
1. The time of Fajr start is most likely not intended to be the Astronomical Dawn which is difficult to perceive, but rather the Nautical Dawn. On this basis the present time of Fajr start is too early and should be a short while later.
2. Am I correct in understanding that the time at which Sehri ends is actually independent of the time of Fajr start. Have you learned if the description "the white thread of dawn appear to you distinct from its black thread" coincides with Fajr start? If so for practical purposes can we assume that these times are close enough to establish an end time for Sehri?
3. The time at which the fast ends is not at the time of Sunset or Isha prayers (when there is no light in the sky), but somewhere in between. That is, the sky need not be fully dark, but the first stars may begin to appear. I have found this article on "Nautical Twilight":
http://en.wikipedia.org/wiki/Twilight#Nautical_twilightThe article mentions that at the end of Civil Twilight (the start of Nautical Twilight) the stars may be visible. Can we approximate the time at which the fast may be ended is close to the "Nautical Twilight", as defined in this article?
4. Is there any Quranic support for the following of the community consensus over individual perception? For example assuming that the community (following Quran only) deems the time of Fajr start to be time of Astronomical Nautical Dawn, but you as an individual perceive that it is too dark outside and still wish to wait a little while longer.