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The curious case of the Milankovitch calendar

Abstract. The Gregorian calendar, despite being more precise than
the Julian (which now lags 13 d behind Earth), will also lag a day behind
nature in this millennium. In 1923, Milutin Milankovitch presented a
calendar of outstanding scientific importance and unprecedented astronomical
accuracy, which was accepted at the Ecumenical Congress of Eastern Orthodox
churches. However, its adoption is still partial in churches and nonexistent
in civil states, despite nearly a century without a better proposition of
calendar reform in terms of both precision and ease of transition, which are
important for acceptance. This article reviews the development of calendars
throughout history and presents the case of Milankovitch's, explaining its
aims and methodology and why it is sometimes mistakenly identified with the
Gregorian because of their long consonance. Religious aspects are briefly
covered, explaining the potential of this calendar to unite secular and
religious purposes through improving accuracy in both contexts.
