One Ummat One Eid, Ramadan And One Laylati Alqadr
The case I made above is that as soon as the first moon is sighted anywhere in the world, that witness should be enough for all Muslims living in any part of the world. That is, as soon as they reach Maghrib (sunset) in their area they should consider moon sighted based on moon sighting witness given earlier in other part of the world. For example, if first moon sighted in Australia than after 5 hours their would be sunset in Pakistan. So Pakistanis should start new month based on witness from Australia that the moon was sighted there. Similarly, in UK the sunset would be after 9 hours. They can use the same witness from Australia to announce start of new month in their country. In the same manner, New York, USA which has a 14 hours time difference with Australia. They can also announce start of new month as soon as they have sunset based on the same witness from Australia. During Prophet Muhammad’s pbuh times it was not possible due to lack of technology and means of communication but now it is quite possible
This video was made from a satellite showing spin of earth and showing how sunset time moves from one country to other: https://youtu.be/oOxFoeXiiSA
Yes its possible to do it on paper. But in reality it will be difficult to implement as there is no unified govt of muslims. Ghamidi sb has said that we can unify under leadership of Saudia Arabia as they guardian of Hijaz,, however, certain factions of muslim will not follow it.