All Acronyms. BLUF [Internet]; Jan 15, 2018 [cited 2018 Jan 15]. Available from: http://www.allacronyms.com/_Military/BLUF. MHRA 'BLUF', All Acronyms, 15 January 2018, <http://www.allacronyms.com/_Military/BLUF> [accessed 15 January 2018] Bluebook All Acronyms, BLUF (Jan. 15, 2018, 11:01 PM), available at http://www.allacronyms.com/_Military/BLUF. CSE All Acronyms. BLUF [Internet]; January 15, 2018 [cited 2018 JAN 15]. Available from: http://www.allacronyms.com/_Military/BLUF.
The noun PTOLEMY has 2 senses: 1. Alexandrian astronomer who proposed a geocentric system of astronomy that was undisputed until Copernicus (2nd century AD) 2. an ancient dynasty of Macedonian kings who ruled Egypt from 323 BC to 30 BC; founded by Ptolemy I and ended with Cleopatra. Familiarity information: PTOLEMY used as a noun is rare.
* Ptolemy develops a geocentric model that has the planets moving around the Earth. However, in order to account for retrograde motion, he put the planets on circles that move in circles. * Copernicus suggests a heliocentric model. His model has the planets moving around the Sun in circular orbits.