What a pleasant surprise to get a Dan Ebberts reply! I think I learned the original expression from an old comment of yours years ago, so how fitting to close the loop the same way. Thank you for all your help over the years!
I had been looking through the reference for valueatTime() and didn’t think to check the toWorld() docs, so didn’t consider it would have a time parameter. D’oh!
This solved it, thanks!
(Hi, me, in 5 years when I forget this and google it, and find this post)