His face appears on the 20,000 colombian peso bill, with the Moon on the same side of the bill, and the Earth as viewed from the Moon's surface on the other side. Because of this, and the blue color of the bill, there is a local folk superstition that bringing offerings of blue candles and blue flowers to his grave in the Central Cemetery of Bogotá and praying there can help one to become wealthy. References Further reading 1865 births 1920 deaths Colombian astronomers 19th-century Colombian mathematicians Colombian civil engineers People from Bogotá Burials at Central Cemetery of Bogotá 20th-century Colombian mathematicians