june 23 2013: largest full moon for 18 years

As the moon circles the earth in an ellipse the distance between them varies, at the nearest (perigree)  it is 363,300 km and at the furthest (apogee) 405 355 km .
figmoon2

The size of the moon as seen from the earth will vary depending on the distance between them.  The position of the moon in its orbit round the earth when it is full will determine its size.  The nearer the apogee the smaller it will appear to be, the nearer the perigee the bigger it will appear.

The changing position of the full moon can be plotted as a graph:

images (7)

lunar-apogee-perigee-2010

Supermoon-size-difference-alec-jones-e1369511419664

the-23-june-2013-supermoon_51c1306aeeaee_w594

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fullmoon

super-moon-mountain550

A lot is known about the moon and it is the only heavenly body to have been visited by humans.This is a site providing up to the minute information about the moon.
http://nineplanets.org/luna.html

Most of this knowledge has been gathered recently. Here is an entry in Arthur Mee‘s Children’s Encyclopedia written in 1930:

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NASA-Apollo8-Dec24-Earthrise

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