Note 4 — Chapter III
Reading edition
Sir W. Herschel several times saw ε Lyræ as a double. Bessel also relates that when he was a lad of thirteen he could see this star double. I think persons having average eye-sight could see it double if they selected a suitable hour for observation. My own eye-sight is not good enough for this, but I can distinctly see this star wedged whenever the line joining the components is inclined about 45° to the horizon, and also when Lyra is near the zenith.