Might be wrong with this, yet as far as I'm aware of, the precision is not really about the number of decimals, but the total amount of digits of some value, meaning more integer digits will result in less decimal ones, at least precise decimal ones. I wouldn't bother with more than 5 decimals though, because unless you need to multiply the value with a huge number afterwards and still have decimals, it won't decisively influence calculations. In other words, there are indeed cases where you absolutely need more decimals, but they are relatively few. In the astronomical calculations you probably need, choosing the suited unit (e.g. km instead of m, AU instead of km or the viceversas) with a limited number of decimals like 3 usually avoids the need for a large number of them.
Statistics: Posted by Yincognito — Today, 10:13 am