Time can mean many things, but Hillis's machine needs to track a particularly messy version: Earth-surface clock/calendar time, which is based on a byzantine agglomeration of astronomical rotations, ...

Time Machine: Boyson clock has been keeping Cedar Rapids on time since 1918. Family jewelers added timepiece when store moved into new building. Diane Fannon-Langton. Mar. 8, 2022 6:00 am.