User manual MEADE ETX AT MODELS

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Detailed instructions for use are in the User's Guide.

[. . . ] Instruction Manual ETX-90AT Astro Telescope ETX-105AT Astro Telescope ETX-125AT Astro Telescope CONTENTS WARNING! Never use a Meade ETX Astro Telescope to look at the Sun!Looking at or near the Sun will cause instant and irreversible damage to your eye. Eye damage is often painless, so there is no warning to the observer that damage has occurred until it is too late. Children should always have adult supervision while observing. ® ® Caution: Use care to install batteries in the orientation indicated by illustration in the battery slots of the battery compartment. [. . . ] The name of the site you have just entered to your list displays; if it does not, scroll to the site. Using the Arrow keys, change the name of the site so that it now reads the name of your observing location. Using the Number Keys, enter the latitude of your observing site and then press ENTER. Using the Number Keys, enter the longitude of your observing site and then press ENTER. (If the site you chose from the list in step 1 has the same Time Zone as the site you are editing, just press ENTER again to go on to the next step. ) "Time Zone" refers to the Greenwich Time Zone shift. Users West of Greenwich, use "-" hours (one hour per time zone) and users East of Greenwich use "+" hours. Using the Arrow keys, scroll to "Site: Select. " The site you have just edited displays. 1. Time Zone Atlantic Eastern Central Mountain Pacific Alaska Hawaii Shift -4 Hours -5 Hours -6 Hours -7 Hours -8 Hours -9 Hours -10 Hours Table 1: Time Zone Shift. Calculations are for standard time. 31 Using Autostar to Find Objects Not in the Database In this procedure, you will enter coordinates of celestial objects that do not appear in any of the Autostar database lists. You may also enter the object's magnitude and size (optional information). Although Autostar contains an extensive database of celestial objects (stars, nebulae, planets, etc. ) that you can observe, you may eventually want to view objects that are not part of the database. Autostar provides a feature that allows you to enter an object's R. A and Dec coordinates in the "User: Objects" option of the Object menu and allows automatic slewing of the telescope to the user-entered coordinates. In order to use this menu option, you first need to look up the R. A and Dec. Check out your local library, computer store or bookstore for astronomy books, CD Roms or magazines (such as Sky & Telescope or Astronomy), to find coordinates of celestial objects. The objects/coordinates you enter become part of your own permanent database, called "User Objects. " To enter coordinates of an object into the "User: Objects" option of the Object menu: 1. Make sure Autostar has been initialized and the telescope has been aligned. After the telescope is aligned, "Select Item: Object" displays. (If necessary, use the Scroll keys to scroll through the menus, as previously described, to find this option. ) Press ENTER. Keep pressing the Scroll Up key until "Object: User Object" displays and press ENTER. "Name" displays on the top line and a blinking cursor on the second line. Use the Arrow keys, as previously described, to enter the name of the object you wish to add to the database. Use the Number keys to enter the digits for the Right Ascension coordinate of your object. [. . . ] Deep-Sky Objects You can use star charts to locate constellations, individual stars and deep-sky objects. Examples of various deep-sky objects are given below: Stars are large gaseous objects that are illuminated by nuclear fusion in their core. Because of their vast distances from our solar system, all stars appear as pinpoints of light, regardless of the size of the telescope used. Nebulae are vast interstellar clouds of gas and dust where stars are formed. [. . . ]

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