A couple of sites are talking nonsense
The moon on March 19 2011 was bigger... so....
The nice thing about this "supermoon" is that there's only a 2 minute difference between fullmoon and perigee, it's just in the middle of the night for Argentina so I believe it will be at daytime in Australia.
It's a nice thing I don't think there's such a coincidence between perigee and fullmoon in the next 100 years.