Manual Celestron CPC Deluxe 800 HD - 11007 (page 38 of 50) (English)

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R –

Reector A telescope in which the light is collected by means

of a mirror.

Resolution The minimum detectable angle an optical system

can detect. Because of diraction, there is a limit

to the minimum angle, resolution. The larger the

aperture, the better the resolution.

Right The angular distance of a celestial

Ascension: (RA) object measured in hours, minutes and

seconds along the Celestial Equator eastward

from the Vernal Equinox.

S –

Schmidt Rated the most important advance in optics.

Telescope in 200 years, the Schmidt telescope combines

the best features of the refractor and reector

for photographic purposes. It was invented in

1930 by Bernhard Voldemar Schmidt (1879-1935).

Sidereal Rate 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.

T –

Terminator The boundary line between the light and dark

portion of the Moon or a planet.

U –

Universe The totality of astronomical things, events, relations

and energies capable of being described objectively.

V –

Variable Star 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.

W –

Waning Moon The period of the Moon’s cycle between

full and new, when its illuminated portion

is decreasing.

Waxing Moon The period of the Moon’s cycle between

new and full, when its illuminated portion

is increasing.

Z –

Zenith The point on the Celestial Sphere directly above the

observer.

Zodiac The zodiac is the portion of the Celestial Sphere that

lies within 8 degrees on either side of the 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 degrees in 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 about 30 degrees since

that time; the signs have moved with it and thus no

longer coincide with the constellations.

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Celestron CPC Deluxe 800 HD - 11007 Manual

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