The Voyage across the Southern Atlantic.
The accounts of Vasco da Gama’s remarkable voyage across the Southern Atlantic are of so scanty a nature that it is quite impossible to lay down his track with certainty. What we learn from the “Journal” may be condensed into a few words. The little armada left São Thiago on August 3rd, going east! On the 18th of that month, when 200 leagues (680 miles) out at sea, the main-yard of the flagship sprung in a squall, and this necessitated laying to for a couple of days and a night. On the 22nd of October,[427] when 800 leagues (2,700 miles) out at sea, going S. by W.,[428] large birds were seen flying to the S.S.E. as if making for the land, as also a whale.[429] On October 27th more whales were seen, besides seals. On November 4th, at 9 A.M., the main land was sighted, probably about 150 miles to the north of St. Helena Bay (30° S.).
In these days of hydrographic offices and sailing directories we know how a sailing vessel desirous of proceeding from the Cape Verde Islands to the Cape would shape her course. She would endeavour to cross the equator about long. 22° W., pass to the leeward of Trinidad Island (20° S.), and then, gradually gaining a higher latitude, trust to the “brave” westerly winds carrying her beyond Tristão da Cunha to the Cape, or beyond.[430]
But Vasco da Gama had none of this information to guide him in shaping his course. He was informed, as a matter of course, about the winds and currents prevailing off the Guinea coast, but of what might be experienced in the open sea beyond he knew nothing.
It is just possible that he may have considered the possibility of reaching the Cape by a direct course of 3,770 miles, and he may even have attempted to carry out such a scheme. In the end, however, he would never have been able to work down against the strong S.E. “trades” and northern currents, for his ships could not be laid nearer than six points to the wind, and even then they would have made considerable leeway.
His actual course, in any case, must have been a circuitous one, and we may suppose it to have been as follows:—Having left São Thiago in an easterly direction,[431] he kept in the direction of the coast for a considerable distance, but when he came within the influence of the dreaded doldrums he met with unpleasant weather in the shape of calms, baffling winds, and squalls, which prevail more especially during the months of June, July, and August. One of these squalls sprung the mainyard of the flagship, and heaving up a new yard necessitated a delay of two days and a night. When attempting to make southing he was driven to the westward, but managed to cross the equator in about 19° west.
Thence he followed a circuitous course, which brought him within 600 miles of the coast of Brazil. The northern part of this assumed course lies to the west of a track recommended by Captain Horsburgh as being most favourable for vessels proceeding between April and October from the Cape Verdes to St. Helena, whilst its southern part lies to the west of the usual track of sailing vessels going from Ascension to the Cape. In this manner we suppose Vasco da Gama to have reached lat. 30° S. long. 15° W., by October 22nd. This point lies about 800 leagues, or 2,700 miles, in a direct line from São Thiago; but by the track assumed by us the distance is 1,030 leagues, or 3,480 miles. As Vasco da Gama spent eighty days in making this distance, including the time lost in repairing his yard, his daily run only amounted to 44 miles.
It was here that Vasco da Gama saw birds flying to the S.S.E. They were no doubt making for Tristão da Cunha, which lies at a distance of about 400 miles in that direction. He also saw a whale, a very common sight in these latitudes.[432]
Thus far the course followed had been more or less southerly, but Vasco da Gama had now passed beyond the S.E. “trades”, and found himself under the welcome influence of “brave” west winds and of an eastern current, running at the rate of a knot in the hour. This speeded him on his course, and he covered the 500 leagues, or 1,700 miles, which still separated him from the west coast of Africa, in the course of thirteen days, making his first landfall on November 4th in about 30° S. His average daily run on this course must, therefore, have amounted to 131 miles.[433]
This may seem a high rate, but it is by no means an exceptional one. Vasco himself made at least 114 miles daily during his passage from Lisbon to the Cape Verdes, and 125 between the Cape and the Guinea coast when homeward bound. Columbus, during his first voyage, averaged 84 miles[434] daily between Gomera and Guanahani, but on nine days his daily run exceeded 150 miles, and on one day—the 4th of September—he actually covered 210 miles, although he had to take into account the bad sailing qualities of one of his vessels, the Niña.