Is the liturgical calendar different between the Novus Ordo (Ordinary Form) and the Extraordinary Form (1962 Missale Romanum)?
In the post-Vatican II liturgy (Ordinary Form), a revised liturgical calendar was created. Certain feast days previously celebrated were removed from the calendar and some liturgical seasons were excised (i.e. the season of Septuagesmia, which is the pre-Lenten season). A restructuring of the readings of Mass was accomplished, creating a three-year cycle of readings for Sundays and a two-year cycle of readings for weekdays. In the celebration of the Extraordinary Form, however, the liturgical calendar of feasts is according to the 1962 Missale Romanum. Maintaining the one-year cycle of readings and propers that was organized by Pope St. Gregory the Great in the 6th century, the Traditional Latin Mass clings to the ancient traditions of the Roman Church.
