Matsyapurana 123.31

123.31

āpūryamāṇo hyudadhir ātmanaivābhipūryate
tato vai kṣīyamāṇe tu svātmanyeva hy apāṃ kṣayaḥ //

When the moon rises in the East, the sea begins to swell. The sea becomes less when the moon wanes. When the sea swells, it does so with its own waters (and not with additional water), and when it subsides, its swelling is lost in its own water (and does not actually lose any water). On the rising of the moon, the sea increases as if its waters have really increased. During the bright and dark fortnights, the sea heaves at the waxing of the moon and becomes placid at the wane of it, but the store of the water remains the same. The sea rises and falls, according to the phases of the moon, and 150 angulis (three-forths of inches, or 112½ inches) is the measure of its rise and fall, on the two parva days (_i.e._, full moon and new moon days respectively). The place between two seas is called a dvîpa. The sea is called Udadhi, on account of its containing water.—30-34.