Leaving Portsmouth on 5 September 1819 the expedition crossed the Antarctic Circle (the first to do so since Cook) on 26 January 1820 (New Style). On 27 January the expedition discovered the Antarctic mainland approaching the Antarctic coast at a point with coordinates 69º21'28"S 2º14'50"W and seeing ice-fields there. The point in question lies within twenty miles of the Antarctic mainland. Bellingshausen's diary, his report to the Russian Naval Minister on 21 July 1821 and other documents, available in the Russian State Museum of the Arctic and Antarctic in Saint Petersburg, Russia, were carefully compared with the log-books of other claimants by the British polar historian A. G. E. Jones in his 1982 study "Antarctica Observed". Jones concluded that Bellingshausen, rather than the Royal Navy's Edward Bransfield on 30 January 1820 or the American Nathaniel Palmer on 17 November 1820, was indeed the discoverer of the sought-after Terra Australis.