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I was born in Texas but my parents are from Spanish origins, therefore my ancestors were mostly Spanish from my fathers side, my mothers side are mostly English. I chose a Spanish ancestor to learn something new from my culture. In addition, I chose someone no many people know about related to an interesting subject like navigation and astronomy.

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Link to treatise of Calculations of Nautical Astronomy pdf

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Link to treatise of Calculations of Nautical Astronomy pdf

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https://ia902704.us.archive.org/10/items/tablesforfacili00cavegoog/tablesforfacili00cavegoog.pdf

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Joseph de Mendoza y Rios was born in Spain 1761 and died in 1816 at the age of 55.  Mendoza was a Spanish astronomer and mathematician.  He published a treatise which is a piece of writing that is formally symmetrical of a certain subject, in his case he published calculations of nautical astronomy. The calculations are used in navigation "to calculate the latitude of a ship at sea from two altitudes of the sun, and the longitude from the distances of the moon from a celestial body." (Wikipedia)  In addition to publishing his nautical astronomy calculations, he also improved the reflecting circle, which is used to measure the angles for navigation. Mendozas work benefited navigation which was used to take more precise measurements for Lunar Navigation.