1. There are a few ways of proving the sighting the moon:

A. News of sighting the moon – on the night of the 29th of Sha’ban when the sky is not clear (cloudy), then the news of sighting the moon given by a muslim male or female, equitable or Mastur-ul-Haal (a person who’s inward state is concealed – whose fisq is not apparent) shall prove the beginning of Ramadan. In the case when the sky is clear, it is sufficient for a person who fulfils the above-mentioned criterions to see the moon outside the place where inhabitants are, such as in an open field, or on a high place. Otherwise, there should be such a great number of people, who witness the sighting of the moon with their naked eye. For the rest of the 11 months, in the case of the sky not being clear, then there should be two (2) witnesses who are equitable (‘adil). In the case of the sky being clear, there should be such a great number of people giving witness (bearing testimony for their sighting of the moon) whose unanimity on speaking falsehood is merely impossible rationally. [Radd al-Muhtar – Vol. 2 Pg. 94-95, and in al-Bahr al-Ra’iq – Vol. 2 Pg. 269]

B. Shahadat ‘ala al-Shahadah (witness upon witness) - this is when the witnesses have not seen the moon themselves. However, those who did see the moon bore witness in front of them of their sighting, and made them witnesses upon this. So, in this way the sighting of the moon is proven, only on the condition that the people who saw the moon are unable and incapable to be present in order to give their witness directly [to the Qazi or the ‘Alim if there is no Qazi]. The way to give witness in this situation is that each person from the people who saw the moon with their naked eyes, makes 2 persons their witness and ask them to become their witness that, “I saw the moon on the night of such and such a day, and such and such a month of such and such a year.” Then each person from the secondary witnesses testify that, “Such and such a person, the son of such and such a person has made me a witness on their sighting of the moon on the night of such and such day, of such and such a month of such and such a year, and they have asked me to become their witness on this sighting.” [Radd al-Muhtar Vol. 4 Pg. 409 and also in Fatawa al-Hindiyyah (‘Alamgiri) Vol. 3 Pg. 410.]

C. Shahadah ‘ala al-Qada’ (giving witness in front of an Islamic Judge) - this means that in another city there came witnesses in front of an Islamic Judge or a Mufti who bore witness of their sighting of the moon, and the Judge or the Mufti has passed a verdict that the moon has been seen, and in the time of giving the witness there were 2 reliable, trustworthy, righteous men present in the Dar-ul-Qada (the Islamic Court) who saw and heard the witnesses giving their witness. These 2 witnesses came to a different city or town and bore witness that, “In such and such a city in front of us and in the presence of the Judge (or the Mufti) there came witnesses who testified that they saw the moon on the night of such and such a day and the Mufti has declared sighting of the moon on such and such a day”, then this shall also be proof of sighting of the moon. [Fatawa al-Imam al-Ghuzza Pg. 6 and Fath al-Qadir Vol. 2 Pg. 243]