Waiting till Zawaal While in Haidh to Fast in Ramadhaan

Q: You stated that a sister should commence with fasting before fajr time has entered. If I did not misunderstand is that the case with nafl? I wanted to clarify if there is any difference in Ramadan. We read in Turkish kitabs that in Ramadan we should wait until zawaal with fasting and if we are sure that we are clean before zawaal and haidh has ended, then ghusl should be taken and make niyyat and fast. Please correct me if I understood wrong because I was practicing on that.

Sighting the Moon of Eid

Q: Today is the 29th of Ramadhaan. It is waajib for a party to observe the sky for the visibility of the moon according to all schools of thought.  Now it is said by astronomical scientists that tonight it is not possible to see it. Do we go and look for the moon in accordance with the teachings of the Sunnah or abandon this Sunnah? Now suppose a group of 2,3,4,5, of reliable, good Muslims come from the village and they testify that they have seen the moon, tonight what do you do?