Strabon, Geographie III 5, 8 schildert die Entdeckungen des Poseidonios bzgl. Ebbe und Flut ausführlich, auf Tage, Monate und Jahre bezoigen:

[...] And yet Poseidonius says that the movement of the ocean is subject to periods like those of the heavenly bodies, since, behaving in accord with the moon, the movement exhibits first the diurnal, secondly the monthly, and thirdly the yearly period; for when the moon rises above the horizon to the extent of a zodiacal sign [30⁰], the sea begins to swell, and perceptibly invades the land until the moon is in the meridian; but when the heavenly Body has begun to decline, the sea retreats again, little by little, until the moon rises a zodiacal sign above her setting; then remains stationary until such time as the moon reaches the setting itself, and, still more than that, until such time as the moon, moving on below the earth, should be a sign distant from the horizon; then invades the land again until the moon reaches the meridian below the earth; then retreats until the moon, moving round toward her risings, is a sign distant from the horizon; but remains stationary again until the moon is elevated a sign above the earth, and then it again invades the land.

As for the monthly period, he says the flux and reflux become greatest about the time of the conjunction (1), and then diminish until the half-moon; and, again, they increase until the full moon and diminish again until the waning half-moon; and then, until the conjunction, the increases take place again, and the increases are further increased in respect both to duration and to speed (2).

As for the annual periods, he says that he learned of them from the people at Gades, who told him that both the retreat and the invasion grew greatest at the time of the summer solstice. And from this he himself surmises that they are diminished from that solstice up to the [autumnal] equinox, increased up to the winter solstice, then diminished up to the spring equinox, and then increased up to the summer solstice. [...]

(1) d.h. wenn Sonne und Mond einander treffen oder passieren im selben Grad des Zodiak, und daher zur Zeit des Neumondes
(2) d.h. das Intervall zwischen Flut und Flut (oder Ebbe und Ebbe) wächst, ebenso die Geschwindigkeit