The earliest drawing of a mariner's astrolabe that has survived is on a chart made by the Portuguese instrument-maker, Diego Ribeiro, in 1528.
Imizobo yangaphambili yezikhephe zencutshe eziphilaya kwitshati eyenzwe ngama Phuthukezi bokwenza isilinganisi uDiezo Ribeiro, ngonyaka wewaka linye linamakhulu amahlanu anamashumi mahlanu anesibhozo.