मानसतरङ्गिणीकृत्
- " A dense part of the Milky Way with excellent sights of star fields, with globular NGC 6760 eta Aquilae in the wing of the Eagle is a Cepheid variable that varies clearly enough to be perceived by the naked eye under good skies over a period of ~ 1 week. .. This star is < 30 Myr old"