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Message: <blockquote data-quote="der_kluge" data-source="post: 1512120" data-attributes="member: 945">The Aztecs had a celestial calendar that tracked the location of the moon in the sky that was highly, highly accurate.  In essence, the moon has a specific location as to where it appears in the night sky.  Someone can provide a specific number, but the moon rotates through this pattern of where it appears in the sky once every 19,000-some odd days.  That equates to 52 years or so.So, as long as your "several years ago" falls into this kind of time period, you could have the PCs consult an ancient, ruined temple of an aztec-like culture to determine the time that such an event occurred.  Now, this pyramid would have information regarding *that* location.  It would be possible to translate the location of this temple to the location your PCs are seeking by basing the difference on their "general vicinity".However, you would need modern-day latitude/longitude to account for minute differences in the appearance of the nightsky within a "general vicinity". In other words, the night sky in boston is probably only marginally different from the night sky in New York City.  Only a computer could probably really tell a difference.Interesting plot you've got going on there, btw.</blockquote>