If you’ve been following along on Kids Korner, you will see every week that I use a special clock to point out where we are in the Christian year. We are now midway between the 4th and 5th Sundays in Easter (which is a 7 week season, not just one day).
Our year starts with Advent I, which is either the last Sunday in November or first Sunday in December. Look at the 25th of December and then count backwards four Sundays.
The only parts that change are the green Sundays, then they get shorter or longer depending on the date of Easter Sunday.
Easter changes because in 325 CE, at the church’s ecumenical Council of Nicaea, it was decided that following the lunar calendar, Easter Sunday would be celebrated on the first Sunday after the first full moon after the Spring Equinox. It corresponds with Passover, which is also following the Jewish lunar calendar.
Pink Sundays are the times when we are particularly mindful of Mary and all mothers. In Advent the focus is on Mary’s expectation of Jesus’ birth, while in Lent it is Mary’s acceptance that Jesus is headed towards Good Friday and his death. There are other days in the Christian Year outside of Sundays where Mary of Nazareth is recognized. The Feast of the Annunciation is March 25th (9 months before Christmas Day), and Mary’s personal feast day is August 15th.
Here is a closer picture of the liturgical clock (this one is a produce by Godly Play).

If you have questions or something to share, feel welcome to use the comment section.