The true motions of the heavenly bodies are universally the opposite of the apparent motions.

The word almanac was used by Roger Bacon (Opus Majus, 1267) for tables of the apparent motions of the heavenly bodies.

They explained the doctrine of the sphere and the apparent motions of the planets, but they had no instruments capable of measuring angular distances.

1° his permutation of the medial to the apparent motions, for it is more rational that all dimensions as of Eccentricities, apogacies, etc.. .