User manual CELESTRON C11

[. . . ] 6. 5. Figure 1B 2 C11 & C150-HD 8. 24. Figure 1C CG-4 EQ Mount 3 INTRODUCTION Congratulations on your purchase and welcome to the Celestron world of astronomy. If you're a newcomer to the hobby of astronomy, some of the terms and telescope components described in this instruction manual may be new to you. This manual is designed to instruct you in the proper use of your Celestron C80HD Refractor, C102-HD Refractor, C11 4. 5 Newtonian or C150-HD Newtonian as well as the CG-4 Equatorial Mount. [. . . ] These distances are measured in degrees, minutes and seconds of arc. There are 60 minutes of arc in each degree, and 60 seconds of arc in each arc minute. Declinations north of the celestial equator are "+" and declinations south are "-". The north pole is +90 and the south pole is -90 . 9 The celestial meridians of longitude are called "coordinates of right ascension (R. A. )", and like the Earth's longitude meridians they extend from pole to pole. coordinates, evenly spaced around the 360º equator, one every 15º. coordinates are a measure of time as well as angular distance. We speak of the Earth's major longitude meridians as being separated by one hour of time because the Earth rotates once every 24 hours (one hour = 15°). The same principle applies to celestial longitudes since the celestial sphere appears to rotate once every 24 hours. Right ascension hours are also divided into minutes of arc and seconds of arc, with each hour having 60 minutes of arc and each arc minute being divided into 60 arc seconds. Figure 5 Astronomers prefer the time designation for R. A. When the telescope's polar axis is pointed at the celestial pole, it is parallel to the Earth's rotational axis. Many of the methods of polar alignment require that you know how to find the celestial pole by identifying stars in the area. setting circle, you will need to know the names of a few of the brightest stars in the sky. If you don't, they can be learned by using the Celestron Sky Maps (#93722) or consulting a current astronomy magazine. Locate a bright star near the celestial equator. The farther you are from the celestial pole the better your reading on the R. A. The star you choose to align the setting circle with should be a bright one whose coordinates are known and easy to look up. Look through the main telescope and see if the star is in the field. If you purchased an optional motor drive, start it now so that it will track the star. Rotate the circle until the proper coordinates line up with the R. A. indicator (the zero mark on the vernier scale). setting circle should rotate freely. NOTE: Because the R. A. setting circle does NOT move as the telescope moves in R. A. , the setting circle must be aligned each time you want to use it to find an object. [. . . ] Polar Axis Finderscope (#94221) ­ This useful accessory helps speeds accurate polar alignment by using an etched reticle for finding the North Celestial Pole. T-Adapters - Allows you to take short exposure photos of the Moon. It requires a 35mm SLR camera and a T-Ring for your brand of camera. Other - Numerous other accessories are available. See the Celestron Accessory Catalog (#93685) or ask your Celestron dealer for details. 16 CELESTRON TWO YEAR WARRANTY A. [. . . ]