Ole Rømer’s Triduum Observations is published in three volumes. Volume I describes Rømer's life and work in general and the establishing of the new observatory, and it presents a detailed, modern analysis of the observations. From letters and manuscripts we get a clear impression of Rømer's thoughts, and from the observations themselves we obtain a detailed understanding of his instruments and clocks. Volume II contains a photographic reproduction of Basis Astronomiæ with an English translation of the Latin text (the first ever), while Volume III presents a photographic reproduction of the Triduum manuscript from 1710 wich has never been published in its original form.

Claus Fabricius is an astronomer working on the European Space Agency project Gaia at the University of Barcelona, Niels Therkel Jørgensen obtained his PhD at the University of Aarhus on a thesis about Peder Horrebow's unpublished Adytum Astronomiæ, and Chr. Gorm Tortzen is a retired associated professor of classical languages.

Ole Rømer’s Triduum vol. I-III is published by the Society for Danish Language and Literature.