Celestron XLT series Instruction Manual page 52

Resolution
Right Ascension: (RA)
S -
Schm idt Telescope
Sidereal Rate
T -
Terminator
U -
Universe
V -
Varia ble Star
W -
Waning Moon
Waxing Moon
Z -
Zenith
Zodiac
The minimum detectable angle an optical system can detect. Because of diffraction, there is a limit
to the minimum angle, resolution. The larger the aperture, the better the resolution.
T
he ang ular distance of a celestial object measured in hours, minutes, and seconds along the
C elestial Equator eastward from the Vernal Equinox.
Rated the most important advance in optics in 200 years, the Schmidt telescope combines the best
features of the refractor and reflector for photographic purposes. It was invented in 1930 by
Bernhard Voldemar Schmidt (1879-1935).
This is the angular speed at which the Earth is rotating. Telescope tracking motors drive the
telescope at this rate. The rate is 15 arc seconds per second or 15 degrees per hour.
boundary
The line between
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
ago. Because of the Precession of the Earth's axis, the Ver
rees
about 30 deg since that time; the signs have moved with it and thus no longer coincide with the
constellations.
the light and dark portion of the moon or a planet.
52
rees
on either side of the
nal Equinox has moved westward by
rees
in
years