Dave Craig explains the nuts and bolts of how Stellarium was used in his recent investigation Why is Maeshowe Squint? This, he says, will help citizen scientists or archaeologists to investigate Maeshowe or other potential alignments themselves. “There will be a particular focus on accuracy and simplicity. If you want, bring along your own laptop with Stellarium and/or Google Earth Pro already installed.” Introductory slides will be available to download from here. Numbers are limited to 12, and booking is essential. Admission free, with a collection for the Stenness Community Association.