Thread: How are the CM I, CM II and CM III numbers defined?
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Old 11-09-2010, 01:26 AM
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lcd1080 (Peter)
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How are the CM I, CM II and CM III numbers defined?
I often see planetary photographs described with 3 numbers, for example
CMI 60, CMII 203, CMIII 43. How are these "CM I, CM II, and CM III" numbers defined?

Thanks,
Peter
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