text: i need information on poseidonius and how he found the size of the moon and as much info as possible? i need information on how posidonius (a grrek philosopher) measured the moon i need a visual aid and information like detailed research or whatever you can give me. here is a detailed explanation of what i need: a)clear explanation of the idea so that someone who has never heard the idea before can understand it from the view of poseidonius. b)visual aid(s) or demonstration to help illustrate the idea. c)why it is important? d)what did he base his thinknig on to form the idea? e)if the theory was later disproved, who disproved it and what was the new theory? try this  http://en.wikipedia.org/wiki/poseidonius