Celestron 8i manual Right Ascension RA

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resolution.

Right Ascension: (RA)

the angular distance of a celestial object measured in hours, minutes, and seconds along

 

the Celestial Equator eastward from the Vernal Equinox.

S -

 

Schmidt Telescope

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).

Sidereal Rate

This is the angular speed at which the Earth is rotating. Telescope tracking motors drive

T -

the telescope at this rate. The rate is 15 arc seconds per second or 15 degrees per hour.

 

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

V -

described objectively.

 

Variable Star

A star whose brightness varies over time due to either inherent properties of the star or

W -

something eclipsing or obscuring the brightness of the star.

 

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

Z -

increasing.

 

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 deg 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

 

deg 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 deg since that time; the signs have moved with it and

 

thus no longer coincide with the constellations.

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Contents Page Hand Control Operation Alignment Procedures Care and Cleaning of the Optics Collimation Page NexStar 8i SE StarPointer Finderscope Eyepiece Diagonal Visual Back Appendix C Longitude Latitude Mounting the Telescope to the Tripod Assembling the NexStarHand Control Powering the NexStarStar Diagonal Eyepiece Star Pointer InstallationStar Pointer Finderscope Star Pointer Operation NexStar Computerized Hand Control Double Stars Hand Control OperationAuto Two-Star Align Alignment ProceduresTwo Star Alignment EQ North / EQ South Alignment Object CatalogNexStar Re-Alignment Selecting an ObjectFinding Planets Tour ModeSlewing to an Object Direction Buttons Setup ProceduresRate Button Page Menu Scope Setup FeaturesUtility Features Helpful Hint NexStar Ready Image Orientation Calculating Magnification FocusingDetermining Field of View General Observing Hints Celestial Coordinate System Motion of the Stars Wedge Align Polar Alignment with optional WedgeFinding the North Celestial Pole Observing the Planets Observing the MoonObserving the Sun Lunar Observing HintsSeeing Conditions Observing Deep Sky ObjectsTransparency Sky IlluminationPage Short Exposure Prime Focus Photography Full Eyepiece ProjectionPlanet ISO Moon Mercury Venus Mars Jupiter Saturn Long Exposure Prime Focus PhotographyPage CCD Imaging Terrestrial PhotographyMetering Reducing VibrationCollimation Care and Cleaning of the OpticsCollimated telescope Should appear Symmetrical with Page Adapter, Car Battery #18769 Page Page Appendix a Technical Specifications Page Appendix B Glossary of Terms Trillion km 5.87 X 1 trillion mi Right Ascension RA Appendix C Longitudes Latitudes Georgia Minnesota Rhode Island Canada Communication Protocol Appendix D RS-232 ConnectionAppendix E Maps of Time Zones Page Page Page Page Page Page Page Celestron TWO Year Warranty

8i specifications

The Celestron 8i is a highly regarded telescope that has made a significant impact in the world of amateur astronomy, renowned for its performance, advanced features, and user-friendly design. Part of Celestron's Advanced Series, the 8i model boasts an impressive 8-inch Schmidt-Cassegrain optical system, which combines the advantages of a large aperture with a compact design. This allows enthusiasts to explore celestial objects with greater clarity, providing bright, sharp images of planets, star clusters, and nebulae.

One of the standout features of the Celestron 8i is its Fast Star capability, which allows for rapid imaging of celestial objects. Coupled with its advanced StarBright XLT coatings, this system enhances light transmission and increases contrast, resulting in a more vivid and detailed observation experience. This combination makes it an ideal choice for both novice and experienced astronomers who seek high-quality visuals of deep-sky objects.

The telescope's computer-controlled GoTo mount simplifies the process of locating and tracking celestial objects. With the push of a button, users can easily access a database containing over 40,000 astronomical objects, allowing for an effortless stargazing experience. The Celestron 8i also features an intuitive hand controller that enables users to customize their observations and seamlessly navigate the night sky.

The Celestron 8i is designed for portability, despite its robust optical performance. Weighing in at around 45 pounds, it is relatively easy to transport to different observing locations. The telescope's sturdy construction ensures stability while providing ease of setup, facilitating a hassle-free stargazing experience.

In terms of accessories, the 8i comes equipped with a 25mm eyepiece, offering a moderate magnification that is perfect for a variety of targets. Additionally, users can expand their observing capabilities with optional eyepieces, filters, and focal reducers, catering to both visual and astrophotography pursuits.

Overall, the Celestron 8i stands out as a versatile and powerful telescope that meets the needs of amateur astronomers at various skill levels. With its advanced features, superior optics, and impressive usability, the 8i offers a unique and rewarding experience under the night sky. Whether for planetary observation or deep-sky exploration, the Celestron 8i remains a top choice for astronomy enthusiasts.
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