The Adagio is crotchet = 60, but the beat is 4-4, and the harmonic changes occur on the minim (ie every two seconds. -ish!), whereas the Andante the beat is 3-4 and the harmonic changes are on the crotchet (just under a second each. -ish.), so it feels as if the Tempo is a little over twice as fast.
Best Wishes.
Best Wishes.
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