Aquila is
best marked by bright (first magnitude) Altair and its two flanking stars, which
together give the sense of the flying Eagle. The three stars
actually depict the Eagle's back and neck; the tail is made of
two stars that together are called Deneb al Okab. Altair lies at the
southern apex of the Summer Triangle.
Serpens (Serpens Cauda) ends at Alya, seen at upper right.