## Tracking Time: The Lunar Calendar and the Long Count
Alvarenga’s grandfather had taught him to tell time by the moon. In the context of the drift, this childhood lesson became one of the essential tools of his mental survival.
Without a watch, without a calendar, without any fixed reference point, the phases of the moon provided the only reliable time-keeping system available to him. A lunar cycle runs approximately 29.5 days — close enough to a month that counting lunar cycles was a reasonable proxy for counting months. Alvarenga tracked the cycles from the beginning of the drift, keeping a running count that told him, at any given point, approximately how long he had been at sea.
By the time he reached Ebon Atoll, he had counted fifteen lunar cycles. Fifteen cycles of approximately 29.5 days each comes to approximately 442 days — consistent with the 438-day figure that Jonathan Franklin’s research established as the documented duration of the drift, from November 17, 2012, to January 30, 2014. The lunar count was not perfectly precise, but it was close enough to serve as a genuine record of the passage of time, and it was available to him every clear night throughout the entire drift.
The act of counting also served a psychological function. Having a way to track time imposed a kind of structure on an experience that was otherwise without structure — without schedules, without destinations, without the normal architecture of days that working life provides. Each new moon was a marker, a specific observable event in an otherwise undifferentiated passage of time. Counting the cycles was something concrete to do with the long, structureless days.