vault backup: 2026-02-05 07:18:20

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+---
+id:
+aliases: []
+title: 2026-02-04 19:35:00
+tags:
+  - authorship/original
+  - destiny/permanent
+  - status/draft
+  - type/timestamped
+dg-publish: true
+daily: "[[2026-02-04]]"
+---
+# 2026-02-04 19:35:00
+
+## Time Interval Conversion
+
+In [[2026-01-09#2026-01-09 12:00]]
+I defined time intervals according to averages
+which are true of the Gregorian calendar for $\lim\limits_{t\to\infty}$,
+but which are not so appropriate for a human lifetime scale.
+
+True of the Gregorian calendar (and its predecessors)
+for all time scales:
+
+$$
+\begin{align*}
+1~\text{Year} &\equiv 12~\text{Months} \\
+1~\text{Week} &\equiv 7~\text{Days}
+\end{align*}
+$$
+
+In 2001--2099 leap years occur exactly once in four years.
+
+$$
+\begin{align*}
+1~\text{Year} &= 365.25~\text{Days} \\
+\end{align*}
+$$