Saturday, 14th January 1769

First part Strong Gales, and very heavy squalls with Hail and Rain; remainder more moderate but unsettled, sometimes a fresh breeze and Squally, and sometimes little wind. Kept plying in the Straits until 1/2 past 4 p.m., at which time the Tide had made strong against us, and the wind not abating, bore away, intending to have hauled under Cape St. Diego, but was prevented by the force of the Tide, which carried us past that Cape with surprising rapidity, at the same time caused a very great sea. At 6, the weather being Clear, took 9, or 3 sets of, Observations of the sun and moon in order to find the Longitude of the place, and as they perhaps are the first Observations of this kind that were ever made so near to the Extremity of South America...


The mean of the three sets is 66 degrees 9 minutes 25 seconds, and the mean of Mr. Green's Computations from the same Observations was 66 degrees 14 minutes 0 seconds, and the mean of his computations and mine will be 66 degrees 11 minutes 32 seconds, and therefore the Longitude of Cape St. Diego or the North-West entrance of Strait Le Maire will be 66 degrees 0 minutes 0 seconds West from Greenwich, and its Latitude 54 degrees 39 minutes South.*

* Modern determination is 54 degrees 40 minutes South, 65 degrees 8 minutes West.
Note: The distance of the sun and moon was taken by Mr. Green alone, my Quadrant being out of Order.

Cape St. Diego bore at this time South by East about 4 Leagues Distant. At 1/2 past 7 Tackt and Stood to the South-East, Cape St. Diego bearing South by East, distance 5 Leagues. At 1 a.m., Squally, wore Ship, Staten Land extending from North to East. At 4, Moderate Weather, loosed a Reef out of each Topsail, the Cape of Good Success West by South, and Cape St. Diego North-North-West, being now in the Strait, but the Tide turning against us soon carried us out. The Violence of the Tide of Ebb rose such a Sea off Cape St. Diego, that it looked as if it was breaking Violently on the ledge of Rocks, and would be taken for such by any who know'd not the true cause. When the Ship was in this Torrent she frequently Pitched her Bowsprit in the Water. By Noon we got under the Land between Cape St. Diego and Cape St. Vincent, where I thought to have Anchored, but found the Bottom every where hard and Rocky; the Depth of Water from 30 to 12 fathoms. Sent the Master to Examine a small Cove which appeared to our View a little to the Eastward of Cape St. Vincent. Wind South-South-West
and South-West by South.