From Moussa Berlin, who plays the lead clarinet:
Our Rabbis taught: He who sees the sun at its turning point, the moon in its power, the planets in their orbits, and the signs of the zodiac in their orderly progress, should say:
Blessed be He who has wrought the work of creation.
And when [does this happen]? — Abaye said:
Every twenty-eight years when the cycle begins again and the Nisan [Spring] equinox falls in Saturn on the evening of Tuesday, going into Wednesday
This year it will happen on the 8th of April 2009 (Erev Pesach 5759)