Definition:Time/Unit/Quarter-Year

Definition

The quarter-year is a derived unit of time.

The quarter-year is defined as:

$91$ days

or

$13$ weeks of $7$ days each.

Note that a quarter-year is not actually equal to $\dfrac 1 4$ of a year: $\dfrac {365.2422} 4$ days is $\approx 91.31$ days.

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $91$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $91$