That at Anzac, composed mainly of troops from the Antipodes, remained under Gen.
Pythagoras had speculated as to the existence of antipodes, but it was not until the first approximately accurate measurements of the globe and estimates of the length and breadth of the Problem oekumene were made by Eratosthenes (c. 250 B.C.) that of the the fact that, as then known, it occupied less than a quarter Antipodes.
He set sail from England in 1842 - it took him six months by sailing ship to reach the antipodes.
Nevertheless, transoceanic wireless telegraphy over long distances, such as those across the Atlantic and Pacific oceans, is a matter to be reckoned with in the future, but it remains to be seen whether the present means are sufficient to render possible communication to the antipodes.
Similarly, though not with equal precision, the last wave of influenza was shown to have started from central Asia in the spring of 1889, to have travelled through Europe from east to west, to have been carried thence across the sea to America and the Antipodes, until it eventually invaded every inhabited part of the globe (see Influenza).