συγκέντρωσις
συγκέντρωσις, a simultaneous relation of centres
συγκέντρωσις, εως, ἡ, Astron.,
- a simultaneous relation of centres, i.e. when the sunʼs centre is at that point of the ecliptic which rises, sets, or culminates coincidently with the rising, etc., of a given star, Ptol. Alm. 8.5 (pl.).