I believe that [judicially noticed fact] [is of such common knowledge] [can be so accurately and readily determined] that it cannot be reasonably disputed. You may, therefore, reasonably treat this fact as proven, even though no evidence has been presented on this point.
As with any fact, however, the final decision whether or not to accept it is for you to make. You are not required to agree with me.
Use of an instruction like this was approved in United States v. Bello, 194 F.3d 18, 25-26 (1st Cir. 1999); see also Fed. R. Evid. 201(g).