Trinity Sunday

Trinity Sunday today: the first Sunday in Trinitytide and the last remaining day in the calendar for the recitation of the Athanasian creed.  In the Ordinariate and the traditional Roman Rite, that is.  It was apparently too unecumenical or something for the Pauline rite.  The Inn has a copy of it here if your liturgical books are not ready to hand.

It's also the feast of St Barnabas.  June 11 used to be the longest day of the year, hence the verse:

Barnaby bright,
The longest day,
And the shortest night.

You'll find St Barnabas in the Acts of the Apostles.  The good old Catholic Encyclopædia has more from tradition here.