| ALMAGEST | Treatise on astronomy written by the ancient mathematician Ptolemy (8) |
| LIKEABLE | Nice line taken by one beginning on astronomy in Oxford college |
| TACTICUS | During the 4th century BCE, he wrote On the Defense of Fortifications, one chapter of which was devoted to cryptography, making it the earliest treatise on the subject. |
| PHARAOHS | The Mummy's produced by Cleopatra and Ptolemy (8) |
| POLITICS | Science or art of government; or, Aristotle's treatise on philosophy (8) |
| EPICURUS | Greek philosopher born in 341 BC who authored treatise On Nature (8) |
| ELEMENTS | Euclid's treatise on geometry |
| ARCHIMEDES | Hear chime described in part by Ancient mathematician (10) |
| SKY | The at Night long-running BBC documentary series on astronomy, presented by Sir Patrick Moore from 1957 to 2013 (3) |
| ARCHIMEDESSCREW | Water-lifting device whose name refers to an ancient mathematician |
| NEWMOON | Does it shed fresh light on astronomy? |
| PYTHAGORAS | Ancient mathematician (10) |
| EUCLID | Ancient mathematician (6) |
| LIGHTHOUSE | Structure built by Ptolemy I on the ancient island of Pharos |
| FLORA | The first name of the heroine in Cold Comfort Farm by Stella Gibbons; a treatise on botany; or, the Roman goddess of spring and blossoming plants (5) |
| SAGITTA | From the Latin meaning "arrow" and listed by Ptolemy in the 2nd century, one of the constellations i |
| ALBERTI | In 1470, he published Trattati in cifra ("Treatise on Ciphers"), in which he described the first cipher disk; he prescribed that the setting of the disk should be changed after enciphering three or fo |
| ASCHAM | Humanist scholar who wrote The Scholemaster and the treatise on archery Toxophilus (6) |
| STONES | The - of Venice ; three-volume treatise on architecture by John Ruskin (6) |
| KAMASUTRA | Ancient Sanskrit treatise on the art of love and sexual technique |
