Meade ETX-80AT Instruction Manual Download

Page: 27 / 44

Date

changes the date used by Autostar. This function is useful to check events in the past or

future. For example, set the Date menu for a day three months in the future. Then check the
"Select Item: Event" menu for the Sunset time on that date. See

EVENT MENU

, page 25.

Time

changes the time entered into Autostar. Setting the correct time is critical for Autostar to

properly calculate locations and events. Time may be set to 24-hour mode (military time) by
selecting the "blank" option which follows the "AM" and "PM" options.

Daylight Saving

is used to enable or disable Daylight Savings time.

NOTE

: Daylight Savings Time may be referred to by different names in various areas

of the world. Check local time to verify.

Telescope

accesses the several options, including:

Model:

Allows you to select the telescope model connected to Autostar.

Focal Length:

Displays the focal length of the selected telescope.

Az Ratio and Alt Ratio

: The Az (Azimuth) ratio and Alt (Altitude) ratio refers to the gears

of the telescope's motors. Do not alter these numbers.

Az Percent

: The Az (Azimuth) Percent allows you to change the azimuth backlash,

i.e.,

the

way the Arrow keys move the telescope along the azimuth (horizontal) axis. If you enter a
value near 100, the telescope tube responds more quickly (it responds immediately at
100%) as you hold down an Arrow key and also slews (moves) the tube more quickly. If
you enter a value near 0, it takes longer for the tube to respond as you hold down an Arrow
key and also slews the tube more slowly. Experiment with this option. Try changing the per-
cent value until you get a "feel" for the Arrow keys that is comfortable for you.

Alt Percent

: The Alt (Altitude) Percent operates identical to the AZ Percent option (see

above), but allows you to change the altitude backlash,

i.e.,

the way the Arrow keys move

the telescope when moving along the altitude (vertical) axis.

Train Drive

: Trains the Altitude and

Azimuth motors to locate objects
with more precision.

If you are experiencing any problems
with pointing accuracy, follow the
procedure described in

APPENDIX C:

TRAINING THE DRIVE

, page 40, to

insure accurate pointing and track-
ing.

Tracking Rate:

Changes the speed

at which the telescope tracks targets
in the sky.

Sidereal:

The default setting for

Autostar; sidereal rate is the
standard rate at which stars
move from East to West across
the sky due to the rotation of the
Earth.

Lunar:

Choose this option to

properly track the Moon over
long observing sessions.

Custom

: Allows entry of user-

defined tracking rates.

Reverse L/R:

Reverses the func-

tions of the Left and Right Arrow
keys (

i.e.

, the Right key moves the

telescope to the left

Reverse UP/DOWN:

Reverses the

functions of the Up and Down Arrow
keys (

i.e.

, the Up key moves the tele-

scope down

TIPS

FOR BEGINNERS

Surf the Web

One of the most exciting resources for astronomy is
the internet. The internet is full of websites with new
images, discoveries, and the latest astronomical
information. For example, when comet Hale-Bopp
made its approach to our Sun in 1998, astronomers
around the world posted new photos daily.

You can find websites for almost any topic relating
to astronomy on the internet. Try the following key
word searches: NASA, Hubble, HST, astronomy,
Messier, satellite, nebula, black hole, variable stars,
etc.

Check out Meade’s website for the latest product
and technical information. You can download the
latest software revisions, links to other astronomical
sites, coordinates of celestial objects and the latest
satellite tracking information for your #494 AutoStar
handbox. See page 30 for more information. You’ll
find our website at:

http://www.meade.com/

Here are some other sites you might find interesting:

•

Sky & Telescope

http://www.skypub.com/

•

Astronomy

http://www2.astronomy.com/astro/

• The Starfield:

http://users.nac.net/gburke/

• Astronomy Picture of the Day:

http://antwrp.gsfc.nasa.goc/apod/