Asterisms · Asterism, also the Lozenge · 4 stars across Draco
Asterism
Dragon Head
The head of Draco: a lozenge of four stars near Vega, whose brightest, Eltanin, passes nearly overhead in London.
- Stars
- Eltanin, Rastaban, Grumium
- Constellation
- Draco
- Spans
- about 6° of sky
- Highest at midnight
- mid June
History
Measuring Eltanin at the zenith in the 1720s, James Bradley discovered the aberration of starlight — the first direct proof that the Earth moves.