User manual CELESTRON ZOOM MASTER II

[. . . ] The NexStar-i is fully upgradeable and can be equipped with the optional NexStar Hand Control with a database of over 40, 000 objects (see the Computerized Hand Control section of this manual) for fully automated operation. Some of the many standard features of the NexStar include: · · · · Incredible 6°/second (or faster) slew speed. Integrated hand controller ­ built into the side of the fork arm. Expandability to add smart accessories such as Computerized Hand Control and GPS capabilities. Many other high performance features! [. . . ] This yields an actual field of . 63°, or a little more than a half of a degree. To convert degrees to feet at 1, 000 yards, which is more useful for terrestrial observing, simply multiply by 52. 5. Continuing with our example, multiply the angular field . 63° by 52. 5. This produces a linear field width of 33 feet at a 34 distance of one thousand yards. The apparent field of each eyepiece that Celestron manufactures is found in the Celestron Accessory Catalog (#93685). General Observing Hints When working with any optical instrument, there are a few things to remember to ensure you get the best possible image. · Never look through window glass. Glass found in household windows is optically imperfect, and as a result, may vary in thickness from one part of a window to the next. This inconsistency can and will affect the ability to focus your telescope. In most cases you will not be able to achieve a truly sharp image, while in some cases, you may actually see a double image. Never look across or over objects that are producing heat waves. This includes asphalt parking lots on hot summer days or building rooftops. Hazy skies, fog, and mist can also make it difficult to focus when viewing terrestrially. All other points are designated by how far (i. e. , how long) they lag behind this coordinate after it passes overhead moving toward the west. Figure 7-1 The celestial sphere seen from the outside showing R. A. and DEC. 36 Motion of the Stars The daily motion of the Sun across the sky is familiar to even the most casual observer. This daily trek is not the Sun moving as early astronomers thought, but the result of the Earth's rotation. The Earth's rotation also causes the stars to do the same, scribing out a large circle as the Earth completes one rotation. The size of the circular path a star follows depends on where it is in the sky. Stars near the celestial equator form the largest circles rising in the east and setting in the west. Moving toward the north celestial pole, the point around which the stars in the northern hemisphere appear to rotate, these circles become smaller. Stars in the mid-celestial latitudes rise in the northeast and set in the northwest. Stars at high celestial latitudes are always above the horizon, and are said to be circumpolar because they never rise and never set. You will never see the stars complete one circle because the sunlight during the day washes out the starlight. However, part of this circular motion of stars in this region of the sky can be seen by setting up a camera on a tripod and opening the shutter for a couple hours. [. . . ] The last two characters will always be zero. The cable required to interface to the telescope has an RS-232 male plug at one end and a 4-4 telephone jack at the other end. The wiring is as follows: 65 APPENDIX E ­ MAPS OF TIME ZONES 66 67 68 69 70 71 72 73 CELESTRON ONE YEAR WARRANTY A. Celestron warrants this telescope to be free from defects in materials and workmanship for one year. Celestron will repair or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship. [. . . ]