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Hi,
AutoCAD works on a double precision based system (>>>details<<<), this does not mean that you can expect a number of decimal places where it works correct and one more it fails. It depends also on the number of places before the decimal sign.
Together with the assignment of units you can work in all (close to) cases with the accuracy you need.
Using Meter or Inch as units will work well as long as you don't have to measure something in light-years. You also won't assign light-years as units when you want to measure distances between atoms.
Having said this ... when you reach the limits of double precision calculation in default cases the value will be rounded. In very few cases it could also happen that the function needed to do a calculation might fail (you might find some threads here discussing issues with finding intersection points when the geometry is placed at very high coordinates).
HTH, - alfred -
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
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(not an Autodesk consultant)