Meade DS-2090 Instruction Manual page 26

Time Zone Shift
Atlantic -4 Hours
Eastern -5 Hours
Central -6 Hours
Mountain -7 Hours
Pacific -8 Hours
Hawaii -10 Hours
Table 1: Time Zone Shift.
{ 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 D: TRAINING THE DRIVE
tracking.
{ Tracking Rate: Changes the speed at which the telescope tracks targets in the sky.
a. 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.
b.
c. Custom: Allows entry of user-defined tracking rates.
{ Reverse L/R: Reverses the functions 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 telescope down).
{ Quiet Slew: Sets the maximum slew rate to 1.5° for quieter operation.
{
Max Elevation: Allows you to enter a value in degrees that sets a limit as to how far the
optical tube can swing upward during a programmed slew. (Note that it does not prevent
you from performing
useful when you have a camera or other peripheral attached to the telescope—you can
prevent it from striking the telescope base.
{
Min AOS (Acquisition of Signal): Allows you enter a value in degrees. This value repre-
sents the altitude
acquiring a satellite track. This is useful when you are observing satellites, but a tall tree or
building is obstructing the telescope. For example, you might begin to track the satellite at
15° altitude, instead of 5°. See
about satellites.
{
Calibrate Motor: If the telescope motors appear to have a problem, use this option to
retest the motors before performing a Reset. This option is also used if an Autostar unit is
moved between telescopes, to match Autostar to the new telescope. To calibrate the
motors, select this option and press ENTER.
{
High Precision: If High Precision is turned on, when looking for a faint celestial object (i.e.,
a nebula or galaxy), Autostar first slews to a nearby bright star and displays "ENTER to
Sync." Center the star in the eyepiece, then press ENTER. At that point the telescope has
a high precision alignment to that part of the sky and it then slews to the object that was
originally requested.
Targets switches between Astronomical targets and Terrestrial targets. If "Astronomical" is
selected, the telescope tracking motor is activated and any object you observe will remain cen-
tered in the eyepiece. If "Terrestrial" is selected, the tracking motor is turned off. To learn how
to track an object automatically, see page 15.
Site provides access to several options including:
{ Select: Displays the currently selected observing site. Use the Scroll keys to cycle through
all available sites (see
ADD
Use this option when you move to a different geographic location.
{ Add: Allows you to add new observing sites to the database (up to six sites may be stored).
Scroll through the list of Countries/States. Press ENTER when the site you wish to add dis-
plays. Then choose the desired city in the same manner.
{
Delete: Deletes a stored site from the database.
{ Edit: Edits a selected site, including: the name, latitude, longitude, and time zone. Time
Zone refers to the Greenwich Mean Time (GMT) time zone shift. Users West of Greenwich,
England use "-" hours, East of Greenwich use "+" hours. For the United States, look up the
time zone shift in
Table 1
, page 37, to insure accurate pointing and
a manual slew
at which your telescope
OBSERVING SATELLITES
below). Press ENTER when the site you wish to select displays.
.
26
past this limit.) This
begins to slew
, page 36, for more information
is
when