Der Himmel dacht auf Anhalts Ruhm und Glück, BWV 66a

Der Himmel dacht auf Anhalts Ruhm und Glück (Since heaven cared for Anhalt's fame and bliss), BWV 66a, is a congratulatory cantata by Johann Sebastian Bach. The work was first performed in Köthen on 10 December 1718.

Bach composed the piece (a secular cantata or serenata) in 1718 in Köthen to celebrate the twenty-fourth birthday of his employer Leopold, Prince of Anhalt-Köthen on 10 December. The cantata text was by Christian Friedrich Hunold, who was based at Halle. Bach and Hunold collaborated on other cantatas, including one for the same birthday, Lobet den Herrn, alle seine Heerscharen, BWV Anh. 5.

Hunold's text was included in a collection which he published the following year and has thus survived. Bach's music has been lost apart from a fragment, but there is scope for its reconstruction as he recycled some of it in at least one sacred work.

Bach adapted several movements for his 1724 cantata for Easter Monday, Erfreut euch, ihr Herzen, BWV 66. While the structure of the sacred cantata is different (it is closed with a chorale, and it opens with music from the closing movement of the secular cantata), Bach preserved the original dialogue form in which two allegorical figures appear. For Die Glückseeligkeit Anhalts (Fortune of Anhalt) and Fama (Fame), he substituted the alto "Fear" in place of Fortune and the tenor "Hope" in place of Fame.

John Eliot Gardiner has suggested that instrumental music from the lost cantata, a sinfonia, appears in Am Abend aber desselbigen Sabbats, BWV 42, which was first performed in 1725.

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