The meridian. A mural instrument that

Carlos Pintado is a Cuban–American writer, playwright and award-winning poet who immigrated to the United States in the early 90s. He received the prestigious 2014 Paz Prize for Poetry for his book Nine coins/Nueve Monedas awarded by the National Poetry Series and published in a bilingual edition by Akashic Press. His book Autorretrato en azul received the Sant Jordi's International Prize for Poetry and his El azar y los tesoros was one of the finalists for Adonais Prize in 2008. He also contributed to the book The exile Experience: a journey to freedom, coordinated by Cuban American music producer Emilio Estefan. In September 2015, The New York Times Magazine published his poem \"The moon\", selected by US Poet Laureate Natasha Trethewey. Some of his works have been published on World Literature Today, The American Poetry Review, The New York Times, Raspa Magazine, among others.

A mural instrument is an angle measuring instrument mounted on or built into a wall. For astronomical purposes, these walls were oriented so they lie precisely on the meridian. A mural instrument that measured angles from 0 to 90 degrees was called a mural quadrant. They were utilized as astronomical devices in ancient Egypt and ancient Greece. Edmond Halley, due to the lack of an assistant and only one vertical wire in his transit, confined himself to the use of a mural quadrant built by George Graham after its erection in 1725 at the Royal Observatory, Greenwich. Bradley's first observation with that quadrant was made on 15 June 1742.