―navigate‖isderivedfromLatinwords‖navis‖,meaningship.SoItisoftensaidthatmodernnavigationisbothanartandasciencewithancientnavigationinitiatingthepracticeasanartandmodernmandevelopingitintoascience.演进EVOLUTION:It isafteralongprocessofdevelopmentthatnavigationhasbecomeasciencewithseveralfieldsinvolved....
was working at the United States Hotel in 1841. Her husband, a free man, had been shanghaied and sold South into slavery. Madame Jumel gave Mrs. Northup and her childern a home by engaging her as a cook who remained in her