Celestron Advanced Series C6-RGT Instruction Manual page 52

T -
Terminator
U -
Universe
V -
Variable Star
W -
Waning Moon
Waxing Moon
Z -
Zenith
Zodiac
telescope at this rate. The rate is 15 arc seconds per second or 15 degrees per hour.
boundary
The line between the light and dark portion of the moon or a planet.
The totality of astronomical things, events, relations and energies capable of being described
objectively.
A star whose brightness varies over time due to either inherent properties of the star or something
eclipsing or obscuring the brightness of the star.
The period of the moon's cycle between full and new, when its illuminated portion is decreasing.
The period of the moon's cycle between new and full, when its illuminated portion is increasing.
The point on the Celestial Sphere directly above the observer.
The zodiac is the portion of the Celestial Sphere that lies within 8 deg
Ecliptic. The apparent paths of the Sun, the Moon, and the planets, with the exception of some
portions of the path of Pluto, lie within this band. Twelve divisions, or signs, each 30 deg
width, comprise the zodiac. These signs coincided with the zodiacal constellations about 2,000 years
ago. Because of the Precession of the Earth's axis, the Vernal Equinox has moved westward by
rees
about 30 deg since that time; the signs have moved with it and thus no longer coincide with the
constellations.
52
rees
on either side of the
rees
in