On the night of September 27th 2011 another supermoon will occur. A supermoon, by definition, is when the Earth, Moon and Sun are all in a line at the same time that the Moon is at its closest approach to Earth. To be a supermoon, the moon has to be either full or new, or else the “line” mentioned above would not exist. This supermoon will take place on Sept. 27 which also coincides with other cellestial alignments. Basically we get a supermoon with an already increased gravitational pull on the Earth on the same day that comet Elenin aligns with the Sun and the Earth!
Basically, the supermoon causes an increase on the gravitational pull on the Earth by the two celestial bodies that influence the gravitational pull the most, the Sun and the Moon. When theses bodies are lined up, such as during a new or full moon, the two gravitational pulls of these two bodies act in concert together on the Earth. That is why the tides are astronomically higher during a full or new moon. When the Sun and Moon are not lined up, they cancel each other out somewhat. When the moon is at perigee (its closest pass to the Earth), the gravitational pull of the Moon on the Earth is also slightly stronger. So all of these facts cause an increased gravitational pull on the Earth during a supermoon and as for the Elenin part, I can’t speak to that. Maybe if we ask Nasa really nicely where a great deal their folks will be during this time we can all understand the implications of such interesting gravitational forces*. As for President Obama, I think he will be busy in Denver (wink, wink).
*NASA announced on Tuesday, September 6th, that astronauts, engineers, education specialists and program scientists from their organization will be in Denver for the week of September 21st to the 27th.(just coincidence, right)