Ash Wednesday, 46 Days Before Easter (Western)

Ash Wednesday opens Western Lent forty six days before Easter, a number that looks larger than the season's own famous forty days because Sundays are excluded from the fasting count even though they fall inside the season's calendar span. Six Sundays fall between Ash Wednesday and Easter, and adding them to the forty fasting days gives the forty six day total this rule records, a piece of arithmetic that reflects a real distinction in practice, Sunday's character as a weekly commemoration of the resurrection that historically was not treated as a fasting day even within a penitential season.

The day's name and central practice, the marking of ashes on the forehead as a sign of penitence and mortality, developed over the early medieval period rather than appearing fully formed from the earliest Church, and the specific liturgical formalization of Ash Wednesday as the fixed opening of Lent solidified across the Western Church by around the eleventh century. This is explicitly distinct from Eastern Orthodox practice, where the parallel Lenten fast begins on a different day entirely, Clean Monday, reckoned by its own distinct calculation rather than by the forty six day Western count.