4,667 B.C. Lat. 40° N.

4,667 B.C. Lat. 40° N.

Constellations above Northern Horizon.
Invisible—Noon, Autumn Equinox.
Visible—Midnight, Spring Equinox,

FIG. 1.

PLATE XX.

FIG. 2.

Constellations above Southern Horizon.
Invisible—Noon, Spring Equinox.
Visible—Midnight, Autumn Equinox.

4,667 B.C. Lat. 40° N.