90 years on – the 1919 eclipse expedition at Príncipe (2009)
Ellis, Richard, Ferreira, Pedro G., Massey, Richard, Weszkalnys , Gisa
Richard Ellis, Pedro G Ferreira, Richard Massey and Gisa Weszkalnys return to Príncipe in the International Year of Astronomy to celebrate the 1919 RAS expedition led by Sir Arthur Eddington.