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Hi Andrew,
Thanks for pointing that out, much appreciated, but its a typo and it should read 686.98/360 which does give me 1.91
Unfortunatly your answer of 0.5240 does give the correct answer but just confusses me even more as to why it would be 360/686.98 instead of 686.98/360.
686.98/360 should be the deg amount mars would move in its rotation around the sun which should be the extra amount mars would need to spin to complete a solar day, according to the statement "The extra angle any planet must rotate on its axis to get the Sun back to the meridian equals the angle amount the planet moved in its orbit in one sidereal day."
I will need to sit and contemplate that for a bit more I think.
Cheers
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