Yet this I must add, (that I be not mistaken) that whereas I cast the time of the daily Tydes to be at all places, when the Moon is there in the _Meridian_; it must be understood of _open_ Seas, where the water hath such free scope for its motions, as if the whole Globe of Earth were equally covered with water: Well knowing, that in _Bayes_ and _In land-Channels_, the position of the Banks and other like causes must needs make the times to be much different from what we suppose in the open Seas: And likewise, that even in the Open Seas, _Islands_, and _Currents_, _Gulfs_ and _Shallows_, may have some influence, though not comparable to that of _Bays_ and _Channels_. And moreover, though I think, that Seamen do commonly reckon the time of High-water in the _Open Seas_, to be then, when the Moon is there in the _Meridian_ (as this Hypothesis would cast it:) Yet I do not take my self to be so well furnished with a _History of Tides_, as to assure my self of it; much less to accommodate it to particular places and cases. Having thus dispatched the main of what I had to say {280} concerning the Seas Ebbing and Flowing: Had I not been already too tedious, I should now proceed to give a further reason, why I do introduce this consideration of the _Common Center of Gravity_ in reference to _Astronomical Accounts_. For indeed, that which may possibly seem at first to be an Objection _against_ it, is with me one reason _for_ it. It may be thought perhaps, that if the Earth should thus describe an _Epicycle_ about the Common Center of Gravity, it would (by this its change of place) disturbe the _Caelestial_ motions; and make the _apparent_ places of the Planets, especially some of them, different from what they would otherwise be. For though so small a removal of the Earth, as the _Epicycle_ would cause (especially if its _Semidiameter_ should not be above 1-1/3 of the Earths Semidiameter) would scarce be sensible (if at all) to the remoter Planets; yet as to the nearer it might.