On these days around the equinox, watching the rising sun in the clear sky,  I recall the Latin Plainsong "A Solis Ortu Usque Ad Occasum" (From the rising of the sun until its setting): When, some forty years ago, accompanied by Isabel, I  spent a year's sabbatical in Germany we joined with another couple in the evenings to sing classical and early music; and this was one of our favorites.