### Clue: Possibly recollecting lines no longer used such as former astronomical systems (10)
### Answer: GEOCENTRIC 
 ### Explanation: Definition: such as former astronomical systems
 **Anagram of**(Possibly) [ "recollecting" **minus**(… no longer used) "l,l"(abbrev. for "line" x 2).
Defn: Describing the former Ptolemaic astronomical model which put Earth as the centre of the universe.