The star [mu] Cygni lies in a corner of the constellation, rather
farther from [zeta] than [zeta] from [epsilon] Cygni. A line from
[epsilon] to [zeta] produced meets [kappa] Pegasi, a fourth-magnitude
star; and [mu] Cygni, a fifth-magnitude star, lies close above [kappa]
Pegasi. The distance between the components is about 5-1/2", their
magnitudes 5 and 6, their colours white and pale blue.

The star [psi] Cygni may next be looked for, but for this a good map of
Cygnus will be wanted, as [psi] is not pointed to by any well-marked
stars. A line from [alpha], parallel to the line joining [gamma] and
[delta], and about one-third longer than that line, would about mark the
position of [psi] Cygni. The distance between the components of this
double is about 3-1/2", their magnitudes 5-1/2 and 8, their colours
white and lilac.

Lastly, the observer may turn to the stars [gamma]_{1} and [gamma]_{2}
Draconis towards the north-west about 40° above the horizon (they are
included in the second map of Plate 2). They form a wide double, having
equal (fifth-magnitude) components, both grey. (See Plate 5.)




CHAPTER VI.

HALF-HOURS WITH THE PLANETS.


In observing the stars, we can select a part of the heavens which may be
conveniently observed; and in this way in the course of a year we can