G - Sources, Notes & Bibliography
A note on sources
This book is intended as an explanation and evaluation of the Marian Calendar rather than as a comprehensive academic history of Martian timekeeping. The bibliography below therefore concentrates on the sources most directly relevant to the architecture discussed in the text.
The history of Martian calendars is considerably larger than the examples examined here. Gangale and Dudley-Rowley's 2005 review identified more than seventy published approaches to Martian timekeeping over the preceding 125 years. The calendars of Levitt, Gangale/Darian, Zubrin, Šurán, Hargitai and Silin are discussed because together they expose many of the principal design choices relevant to Marian: annual scale, weekly recurrence, elapsed-time regularity, seasonal representation, intercalation and familiarity. Gangale and Dudley-Rowley's historical work provides the broader context. ScienceDirect
Definitions and numerical conventions relating to the Martian sol, areocentric solar longitude (Ls), Airy-0 and Martian solar time draw principally upon the work of Michael Allison and Megan McEwen and the NASA Mars24 technical documentation. NASA GIS
The detailed Marian astronomical analysis, intercalation modelling and Earth–Mars communications calculations are documented separately in The Marian Calendar: Design and Evaluation of a Civil Time Architecture for Mars and its associated computational reproducibility package. The book deliberately presents the conclusions of that work rather than reproducing every calculation. The 2026 research preprint is archived at doi:10.5281/zenodo.22687143, and its computational data and reproducibility package at doi:10.5281/zenodo.22686413. These existing deposits are distinct from the separately author-ratified Marian Protocol v1.0, whose authoritative specification and conformance materials are available in the open Marian technical repository.
The discussion of China's Twenty-Four Solar Terms uses them only as a cultural and structural precedent for a named sequence of twenty-four annual positions. They are astronomical and seasonal markers, not civil months and not equivalents of Marian minths. UNESCO inscribed the tradition on the Representative List of the Intangible Cultural Heritage of Humanity in 2016. UNESCO Intangible Cultural Heritage
Selected bibliography
Allison, Michael, and Megan McEwen. “A Post-Pathfinder Evaluation of Aerocentric Solar Coordinates with Improved Timing Recipes for Mars Seasonal/Diurnal Climate Studies.” Planetary and Space Science 48 (2000): 215–235. DOI: 10.1016/S0032-0633(99)00092-6. NASA GIS
Bullock, Jonathan. The Marian Calendar: Design and Evaluation of a Civil Time Architecture for Mars. Preprint v1.0, 2026. Publicly archived research preprint: doi:10.5281/zenodo.22687143. Associated computational data and reproducibility archive: doi:10.5281/zenodo.22686413. Neither DOI denotes the later official Marian Protocol v1.0 release.
Fairman, John C. “The Darian, Utopian, and Zubrin Calendars and Seasonal Dissonance (Part One).” 22nd Annual International Mars Society Convention, 2019. marspapers.org
Gangale, Thomas. “Martian Standard Time.” Journal of the British Interplanetary Society 39, no. 6 (1986): 282–288. OPS-Alaska
Gangale, Thomas. “The Darian Calendar.” Proceedings of the Founding Convention of the Mars Society, MAR 98-095, 1998.
Gangale, Thomas. “The Architecture of Time, Part 2: The Darian System for Mars.” SAE Technical Paper 2006-01-2249, 2006. DOI: 10.4271/2006-01-2249.
Gangale, Thomas, and Marilyn Dudley-Rowley. “Issues and Options for a Martian Calendar.” Planetary and Space Science 53, nos. 14–15 (2005): 1483–1495. DOI: 10.1016/j.pss.2005.07.012. ScienceDirect
Hargitai, Henrik, Sz. Bérczi, Sz. Nagy, A. Gucsik and Á. Kereszturi. “Mars Climate Diagram Database.” Lunar and Planetary Science XXXIX, Abstract 1476, 2008. LPI
Levitt, I. M. “Mars Clock and Calendar.” Sky & Telescope, May 1954: 216–217. OPS-Alaska
NASA Goddard Institute for Space Studies. Mars24 Sunclock: Technical Notes on Mars Solar Time. Updated 2023. NASA GIS
Silin, Dennis V. “The Exodus Calendar: A Simple Timekeeping System for Martian Colonists.” Journal of the British Interplanetary Society 78, no. 9 (2025): 305–307. DOI: 10.59332/jbis-078-09-0305. ResearchGate
Šurán, Josef. “A Calendar for Mars.” Planetary and Space Science 45, no. 6 (1997): 705–708. DOI: 10.1016/S0032-0633(97)00033-0. ScienceDirect
UNESCO. “The Twenty-Four Solar Terms, Knowledge in China of Time and Practices Developed through Observation of the Sun's Annual Motion.” Representative List of the Intangible Cultural Heritage of Humanity, inscribed 2016. UNESCO Intangible Cultural Heritage
Zubrin, Robert, with Richard Wagner. The Case for Mars: The Plan to Settle the Red Planet and Why We Must. New York: Free Press, 1996.