The Category Mistake of Cislunar Time: Why NASA Cannot Synchronize What Doesn't Exist
A new paper claims NASA's Coordinated Lunar Time project is built on a fundamental misunderstanding of what time actually is.
A provocative new arXiv paper from computer scientist Paul Borrill challenges the fundamental premise of NASA's Coordinated Lunar Time (LTC) initiative. The paper, titled 'The Category Mistake of Cislunar Time: Why NASA Cannot Synchronize What Doesn't Exist,' argues that NASA's entire approach to establishing a lunar time standard by December 2026 is built on a philosophical error. Borrill applies concepts from quantum foundations—specifically the ontic/epistemic distinction developed by Robert Spekkens—to argue that NASA's plan treats 'synchronized time' as an objective entity that can be transmitted from authoritative atomic clocks via LunaNet, when in reality time is an epistemic construct dependent on observer-relative clock relationships.
The paper analyzes the cislunar time program through multiple theoretical frameworks: Forward-In-Time-Only (FITO) assumptions, Spekkens' Leibnizian operationalism, and the Wood-Spekkens fine-tuning argument. Borrill shows that the same conceptual move that resolves quantum mysteries—distinguishing what is truly physical (ontic) from what is knowledge-based (epistemic)—reveals the lunar time synchronization project as 'an engineering project built on a philosophical confusion.' The White House directive from April 2024 assumes relativistic corrections and clock distribution can create a unified standard, but Borrill argues this misunderstands time's fundamental nature.
Instead of unidirectional time distribution, Borrill sketches a transactional alternative grounded in bilateral atomic interactions. The paper represents a significant philosophical challenge to a major NASA engineering initiative, suggesting that billions in funding and years of planning might be addressing a problem that doesn't exist in the way NASA conceptualizes it. This has implications not just for lunar operations but for distributed computing systems, quantum networks, and fundamental physics research moving forward.
- Paper argues NASA's Coordinated Lunar Time program commits a 'category mistake' by treating time as objective rather than observer-relative
- Applies quantum foundations concepts (ontic/epistemic distinction) typically used to resolve quantum paradoxes to critique engineering approach
- Proposes transactional atomic interactions as alternative to unidirectional time distribution via LunaNet network
Why It Matters
Challenges fundamental assumptions of a $B+ NASA program and could reshape how we design distributed systems in space.