331,000 stars in an area of only 5[deg] in Cygnus.

[Illustration: CYGNUS]

AQUILA (ak'-wi-l[:a])--THE EAGLE, AND ANTINO[:U]S. (Face Southeast.)

LOCATION.--Half-way up the sky in the Milky Way, you will see three
stars in a line, the middle one much brighter than the other two. This
bright star is Altair, in Aquila. It forms with Vega and Deneb an
isosceles triangle. Altair is at the apex, about 35[deg] from the other
two. A triangle is formed by Vega, Altair, and Ras Alhague, in the
Serpent Bearer, which is about 30[deg] west of Altair.

This is a double constellation composed of Aquila and Antino[:u]s. Altair
is in the neck of the Eagle, Alschain in the head of Antino[:u]s.

When the moon is absent, a rude arrowhead can be traced out, embracing
almost all the stars in Aquila.

[[^e]] is an interesting variable star, changing from magnitude 3.5 to
4.7 and back again within a period of 7 days 4 hours 12 minutes.

Altair rises about 8[deg] north of the exact eastern point on the horizon.

In A.D. 389 a wonderful temporary star flashed out near Altair that
equalled Venus in brightness and vanished within three weeks' time.

[Illustration: AQUILA

ANTINO[:U]S]

DELPHINUS (del-fi'-nus)--THE DOLPHIN, OR JOB'S COFFIN. (Face
Southeast.)

LOCATION.--The little cluster of five stars forming Delphinus is to be
seen about 10[deg] northeast of Altair, and, though there are no bright
stars in the group, it can hardly escape notice. A line drawn from
Vega to Albireo, and prolonged about 20[deg], strikes the star [e] in the
tail of the Dolphin. The four other stars of prominence in the
constellation are a little above [e], and form a diamond-shaped
figure.

The little asterisms Sagitta, the Arrow, and Vulpecula and Anser, the
Fox and Goose, are shown just above Delphinus.

Delphinus is also called Job's Coffin. The origin of this appellation
is unknown.

In Greece, Delphinus was the Sacred Fish, the sky emblem of
philanthropy. The Arabs called it the "Riding Camel."

The star [g] Delphini is a fine double for a small telescope with a
marked and beautiful contrast of colors.

The names for [a] and [b] reversed spell "Nicolaus Venator," the
Latinized name of the assistant to the astronomer Piazzi.

[Illustration: DELPHINUS]

SAGITTARIUS (saj-i-t[=a]-ri-us)--THE ARCHER. (Face South.)

LOCATION.--A line drawn from Deneb, in Cygnus, to Altair, in Aquila,
and prolonged an equal distance, ter