Meade DS-90 Instruction Manual download pdf (Page 19)

Two-Star Alt/Az Alignment

Two-Star Alignment requires some knowledge of the night sky. Two-Star Alignment is identical

to Easy: Align (see

EASY (TWO-STAR) ALIGN, above), except Autostar displays a database of

bright stars and two stars are chosen by the observer from this database for alignment. It is rec-

ommended that you choose stars with which you are familiar from this database when first try-

ing out this method or the One-Star Alignment method.

One-Star Alt/Az Alignment

One-Star Alignment also requires some knowledge of the night sky. One-Star Alignment is iden-

tical to Easy: Align (see EASY (TWO-STAR) ALIGN, above), except Autostar displays a database

of br

ight stars and

one star is chosen b

y the observer

from this database f

or alignment.

IMPORTANT NOTE: The accuracy of One-Star Alt/Az Alignment, unlike the Two-

Star Alignment procedures, depends on how well the observer levels the telescope

and how close to North the telescope is pointed when setting the Home Position

(Fig. 16). Because the Two-Star Alignment methods use two stars to align upon,

they are more precise than One-Star Alignment.

Go To Saturn

After performing the Easy Align procedure, the motor drive begins operating and the telescope

is aligned for a night of viewing. Objects in the eyepiece should maintain their position even

though the Earth is rotating beneath the stars.

IMPORTANT NOTE: Once aligned, only use GO TO or the Arrow keys to move the

telescope. Do not loosen the telescope locks (10 and 26, Fig. 1), or move the base

manually, or alignment will be lost.

This exercise shows how to select a celestial object (Saturn) for viewing from Autostar’s database.

NOTE: Saturn is not visible all the time and you may need to choose another object

from Autostar's Object database; however, the procedure, as described below,

remains the same; just choose a different object in step #3.

1 After the telescope is aligned, “Select Item: Object” displays. Press ENTER.

2. “Object: Solar System” displays. Press ENTER.

3. “Solar System: Mercury” displays. Keep pressing the Scroll Down key until “Solar System:

Saturn” displays.

4. Press ENTER. “Calculating” displays. Then “Saturn” and a set of coordinates displays.

Note that Saturn’s (and other planets’) coordinates change throughout the year.

5. Press GO TO. “Saturn: Slewing...” displays and the telescope slews until it finds Saturn.You

may need to use the Arrow keys to center Saturn precisely in the eyepiece. Autostar then

automatically moves the telescope so that it "tracks" Saturn (or whatever other object you

may have chosen);

i.e., Saturn remains centered in the eyepiece.

Take a Guided Tour

This example demonstrates using “Tonight’s Best” Guided Tour.

After obser

ving Saturn, press MODE twice so that “Select Item: Object” displays again.

2. Press the Scroll Down key twice. “Select Item: Guided Tour” displays.

3. Press ENTER. “Guided Tour: Tonight’s Best” displays. Press ENTER.

NOTE: If you wish to try out other Guided Tours, press the Scroll Down key to scroll

through other tour choices. When the tour you wish to select displays, press

ENTER.

“T

onight’s Best: Searching...” displays. After calculating, “Tonight’s Best: Jupiter” displays.

NOTE: Different objects may be displayed on a tour list on any given night.

Press ENTER to display information about the object. Press GO TO to move the telescope

to the object.

Press MODE to retur

n to the

our list.

Press the Scroll keys to scroll through the list. Press

ENTER when y

ou find the ne

xt object y

ou wish to observe.

Press and hold down MODE for two seconds to exit the Guided Tour menu.

Fig. 18: One of the

most beautiful celes-

tial sights, Saturn.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 43 44

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Meade DS-90 Instruction Manual Page 19

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