April

Halley´s approach. April 10, 1910.

Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–76 years. Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and the only naked-eye comet that might appear twice in a human lifetime. Halley last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061 to 2062. Halley’s returns to the inner Solar System have been observed and recorded by astronomers since at least 240 BC. Clear records of the comet’s appearances were made by Chinese, Babylonian, and medieval European chroniclers, but, at those times, were not recognized as reappearances of the same object. The comet’s periodicity was first determined in 1705 by English astronomer Edmond Halley,...

Cabral lands foot in Brazil. April 22, 1500.

On 15 February 1500, Cabral was appointed Capitão-mor (literally Major-Captain, or commander-in-chief) of a fleet sailing for India. It was then the custom for the Portuguese Crown to appoint nobles to naval and military commands, regardless of experience or professional competence. Cabral became the military chief, while far more experienced navigators were seconded to the expedition to aid him in naval matters. The most important of these were Bartolomeu Dias, Diogo Dias and Nicolau Coelho. They would, along with the other captains, command 13 ships and 1,500 men, of which 700 were soldiers, although most of them had no combat experience. The fleet had two divisions. The first division was composed of nine naus (carracks) and two round caravels, and was headed to Calicut in India with th...

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