In Jewish accounting of time, the “day” begins and ends at sundown. This concept survives in Christian liturgy; the “Eve of” a Holy Day is the beginning of that Holy Day. Christmas Eve is the beginning of Christmas, All Hallow’s Eve is the beginning of All Saints’ Day, and so on.
It can be easy to forget, but Sundays are Holy Days, or feast days, too. Therefore, as the rubrics in Calendar of the Christian Year explain:
Following ancient Jewish tradition, the celebration of any Sunday begins at sundown on the Saturday that precedes it. Therefore at Evening Prayer on Saturdays (other than Holy Days), the Collect appointed for the ensuing Sunday is used.
So when you pray Evening Prayer later today, make sure you read the next Collect of the Day: “Keep, O Lord, your household the Church in continual godliness…” This isn’t just a nit-picky point to make sure you “get your prayers right”, but can also help you prepare for church tomorrow morning! If you pray this Collect tonight and again at Morning Prayer before the Communion service tomorrow, then by the time you hear it (or say it yourself) in church it’ll be fresh on your mind already. Just like with music or preaching, a prayer that is prepared is easier to share!
Note: this blog will not be updated tomorrow, or on subsequent Sunday mornings. I’m rather assuming that you, like me, have got enough to do already at that time!