Common mistakes and pitfalls

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• Julian Dates Start at Noon UTC.
• Remember to Account for Leap Seconds.
• Negative Longitudes are Handled Differently by Different Systems.
• Julian Dates are not Dates in the Julian Calendar.
• Small Errors May be due to Incorrect Time Handling.
• Verify the RA/Dec (and Other) Systems Used.
• Let Users Know the Algorithms, Systems, and Corrections Applied to Data.