Notice he went clockwise with Antarctica on his starboard side.
Think it throught, Dave. Is that the way it would work if he went clockwise around the flat Earth?
How would you keep an ice wall to you starboard (right) side if you were sailing clockwise (i.e. turning toward your starboard side)? You couldn't!
If you sailed between Cape Horn and Antarctica from west to east (i.e. clockwise) then Antarctica is on your starboard side (right side). And, in order to go around Antarctica, you have to sail to starboard and make continuous course corrections to starboard NOT TO PORT!
If Antarctica were really an ice wall, to circumnavigate Antarctica, again sailing west to east between Cape Horn and Antarctica, would require you to make course corrections to port (i.e. counter-clockwise) or else you're going to eventually run into the ice wall!
That is PROOF that Antarctica cannot possibly be an ice wall surrounding the perimeter of the earth.
That's absolute, utter, beyond a shadow of a doubt - PROOF!
As for your 60,000 miles argument. It's bunk. If you zig-zag enough you can fit a 60,000 mile long line into a circle the size of your fist. Plus, I don't believe he actually sailed that far. His records are wrong or whoever you're getting that information from is wrong. If you get Google Maps and roughly trace out the path shown on your map, the course he took is closer to 20,000 miles. A third of the supposed 60,000. Even marginally more zig-zagging than is implied by the course on the map could potentially account for the extra mileage but it's more probably that the 60,000 mile number is overstated.
They did not count zigzags as miles, all sailing ships will encounter different winds and will not zigzag the same way. Nautical miles are straight, or all their maps would be worthless. There is no way that 10,000 miles becomes 60,000 miles. They made accurate maps, not relative ones.
--Dave