Marking Time traces how the familiar calendar grew from a patchwork of astronomical observations, political decisions, and cultural customs. The narrative moves from early lunar cycles through classical reforms and the long, uneven road to the modern calendar.

The book highlights key episodes and figures—ancient Greek month-makers, Julius Caesar's reform, medieval practices such as Britain's March 25 New Year, and later scientific input—showing how comets, religious practice, and scientific calculation all shaped calendar systems.

Readers gain a clearer sense of why months and years vary across cultures, why there is no year zero, and what proposals have been offered to simplify timekeeping. The writing blends historical detail with accessible explanations of astronomical and civic choices.

• Origins of lunar and solar calendars
• Julian and later reforms
• Notable figures and historical anecdotes
• Modern reform proposals and timekeeping science

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