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" ... Kramer first pulled data on moons down from NASA, then developed a computer program to compare just their angular sizes at the extremes of their orbits. 'I was not looking at detailed circumstances, just a simple comparison,' said Kramer, who looked at the distance of the sun at perihelion (the point in planet's orbit nearest to the sun) and aphelion (furthest) to determine the maximum and minimum sizes would appear. He then added the data for each moon at periapsis (nearest to the body that it orbits) and apoapsis (furthest) and looked at the range. Divide one by the other and you get a size ratio. 'A ratio of greater than 1 means an annular eclipse event, and a ratio of less than one means a total eclipse event,' explained Kramer. ... "