exactly opposite the star
Megres in Ursa Major; with [a] Andromedae and [g] Pegasi it marks the
equinoctial colure. These stars are known as "The Three Guides."

The chair can be readily traced out; [b], [a], and [g] mark three of
the four corners of the back, and [d] and [e], one of the front legs.
The word "Bagdei," made up of the letters for the principal stars,
assists the memory.

The stars [g] and [b] are pointer stars to a fifth-magnitude star the
lucida of the asterism Lacerta, the lizard about 15[deg] from [b].

Cassiopeia makes an excellent illuminated clock. When [b] is above
Polaris it is noon, when it is in the west at right angles to its
first position it is 6 P.M. At midnight it is on the northern horizon,
and at 6 P.M. it is due east.

This is sidereal time which agrees with mean time on March 22d, and
gains on the latter at the rate of two hours a month.

[Illustration: CASSIOPEIA]

CEPHEUS (s[=e]'-f[=u]s) (Face North.)

LOCATION.--A line drawn from [a] to [b] Cassiopeiae and prolonged about
18[deg] strikes [a] Cephei. The nearest bright star west of Polaris is [g]
Cephei. Cepheus is an inconspicuous constellation, lying partly in the
Milky Way. A view of this constellation through an opera-glass will
repay the observer. Cepheus is characterized by a rude square, one
side of which is the base of an isosceles triangle. Look for the
so-called garnet star [m], probably the reddest star visible to the
naked eye in the United States. The star [z] has a blue companion
star.

[a] forms an equilateral triangle with Polaris and [e] Cassiopeiae.

It is claimed that Cepheus was known to the Chaldaeans twenty-three
centuries before our era.

Surrounding [d], [e], [z], and [l], which mark the king's head, is a
vacant space in the Milky Way, similar to the Coal Sack of Cygnus.

About 4[deg] from [g], in the direction of [k] is a pretty pair of
sixth-magnitude stars.

Owing to precession, [g], [b], and [a] Cephei will be successively the
Pole Star in 4500, 6000, and 7500 A.D. respectively.

[d] is a double whose components are yellow and blue. It is an
interesting variable changing from magnitude 3.7 to 4.9 at intervals
of 5 days 8 hours 47 minutes. As it is three times as bright at
maximum as at minimum and can be observed with the naked eye its
variations are well worth observing.

[Illustration: CEPHEUS]

PEGASUS (peg'-a-sus)--THE WINGED HORSE. (Face South.)

LOCATION.--One cor