## Fourteen Weeks in Descriptive Astronomy |

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Page 35

The

above t us, is termed the

here. First, that so far distant is this imaginary arch from us, that if any two parallel

lines ...

The

**Celestial Sphere**. — The blue arch of the sky, as it appears to be spreadabove t us, is termed the

**Celestial Sphere**. There are two points to be noticedhere. First, that so far distant is this imaginary arch from us, that if any two parallel

lines ...

Page 36

This sphere of stars surrounds the earth on every side. In the daytime we cannot

... the

the Horizon, the Equinoctial, and the Ecliptic Systems. Each of these has (1) its ...

This sphere of stars surrounds the earth on every side. In the daytime we cannot

... the

**celestial sphere**there are imagined to be drawn three systems of circles :the Horizon, the Equinoctial, and the Ecliptic Systems. Each of these has (1) its ...

Page 37

... the Nadir, the N., S., E., and W. points. The Zenith is the point directly overhead,

and the Nadir the one directly underfoot. They are also the poles of the horizon —

i. e., the points where the axis of the horizon pierces the

... the Nadir, the N., S., E., and W. points. The Zenith is the point directly overhead,

and the Nadir the one directly underfoot. They are also the poles of the horizon —

i. e., the points where the axis of the horizon pierces the

**celestial sphere**. Page 38

(a) The Principal Circle is the Equinoctial. This is the Celestial Equator, or the

earth's equator, extended to the

These are the Hour Circles (Bight Ascension Meridians) and the Declination

Parallels.

(a) The Principal Circle is the Equinoctial. This is the Celestial Equator, or the

earth's equator, extended to the

**Celestial Sphere**. (b) Subordinate Circles. —These are the Hour Circles (Bight Ascension Meridians) and the Declination

Parallels.

Page 39

as the parallels of terrestrial latitude extended to the

Points are the Celestial Poles and the ' Equinoxes. The Celestial Poles are the

points where the axis of the earth extended pierces the

the ...

as the parallels of terrestrial latitude extended to the

**Celestial Sphere**. (c) ThePoints are the Celestial Poles and the ' Equinoxes. The Celestial Poles are the

points where the axis of the earth extended pierces the

**Celestial Sphere**, and arethe ...

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ancients angle aphelion appear Aries astronomers atmosphere axis bright brilliant Canis Minor Capricornus Cassiopeia cause celestial Celestial Sphere centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk earth east ecliptic equal equator equinoctial figure fixed stars globe heat heavenly bodies heavens Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light luminous lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon's motion move naked eye nearly nebula Neptune node north pole orbit Orion parallax pass path penumbra perihelion Perseus Pisces planet polar Polaris rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space sphere spots summer sun's surface synodic revolution tance Taurus telescope theory tion umbra Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible winter zenith Zodiac