It must be remembered that, this Calendar is purely scientific and has no consideration of sightability in Makkah or anywhere in the world. It may go against actual sighting somewhere on earth, when in some month the moon will be visible in some part of the world and month in this calendar does not start on the following day, e.g., Ramadan 1430 moon will be sightable on August 20, 2009 in Polynesian Islands, and 1st day of Ramadan should be August 21, 2009, but the Ummul-Qura Calendar shows it as August 22, 2009. Similar thing will happen in Dhul-Qi'dah 1430 when moon can be easily seen in Polynesiam Island on October 18, 2009, and Ummul-Qura Calendar shows 1st Dhul-Qi'dah on October 20, 2009. Click on the map on left. This happens because the moon sometimes is in the Southern hemisphere, where it can be seen, but it is not above the horizon of Makkah.
For this reason, Moonsighting.com is presenting a Suggested Global Lunar Calendar, which is based on Imkan-e-Ru'yah (sighting possibility) somewhere in the world, given below: