This document compares the Domesday Book created in 1086 AD in England to collect information on land ownership and taxation to modern uses of big data. It notes that both involved collecting facts/data (surveys in Domesday Book, algorithms with modern big data) and frameworks for making sense of the information (the Winchester Roll and Judgment for Domesday Book, analytics and visualization for big data). However, it cautions that facts are complicated and never "just facts", and both the process of collecting data and analyzing it can shape what is visible or invisible in the results.