A liturgical church calendar circle is a graphical representation of the seasons of the church (liturgical) calendar. It details the segments of the liturgical year: Advent, Christmas, Ordinary Time, Lent, Easter and Ordinary Time.
By using a circle to depict the calendar, the ongoing and ceaseless nature of the church seasons, flowing one into the next, is reinforced. "Ordinary Time" is the term used to refer to all times that fall outside the seasons of Christmas, Lent and Easter.
The liturgical year begins with Advent, the four Sundays before Christmas and is followed by Christmas (also known as Christmastide), which lasts until Epiphany, January 6th. Ordinary Time resumes following Christmas, until Lent begins, on Ash Wednesday. Lent marks the 40 days before Easter. Easter, or Eastertide, continues through Pentecost, which falls 50 days after Easter. Once Eastertide is over, Ordinary Time resumes until the next Advent.
Many Christian groups use the liturgical calendar to plan and order their worship, including the Roman Catholic church and mainline Protestants such as Episcopalians, United Methodists and Presbyterians.
Each liturgical season features a different color: Advent is purple or blue, Christmas is white, Ordinary Time is green, Lent is purple or red, and Easter is white.