Eagle Mach 1 Spezifikationen PDF herunterladen (Seite 10)

your 6” Eagle Adjustable Folding Pier, your Astro-Physics Portable Pier, or the adapter of your Adjustable Wood Tripod.

Fasten with the three P

IER ADAPTER KNOBS. If you are attaching the Control Box Adapter or a Tray Support Bar at the top of

your pier or tripod, do that now. (Note: photo on next page is of an earlier vintage with three pier attachment holes.)

Altitude and Azimuth Adjustments - Rough polar alignment

For rough polar alignment, your goal is to sight the

celestial pole when looking through the polar

alignment sight hole in the center of the polar axis.

You will need to make altitude (up/down) and

azimuth (side-to-side) adjustments to the position

of the mount. Before beginning, make sure that

the mount is pointing roughly north using the built-

in compass and that your pier or tripod is level

using the mount’s built-in bubble level. (Refer to

note below.)

Remember that magnetic north is not the same as

true north and varies both with time and with your

location. In the fall of 2006, on the northeast tip of

Maine, for example, magnetic north is

west of true

north by a whopping 18 1/2 degrees! On Mauna

Kea in Hawaii, by contrast, magnetic north is

about 9 1/2 degrees

east of true north. Observers

along the Mississippi River are lucky and are

nearly dead on.

These values change by several minutes every

year. With experience at a particular site,

however, you will soon learn to use the compass

to find true north. (You will know just how far off

magnetic north is for your location.) In addition,

there is a website funded by our U.S. tax dollars

that will compute the declination of magnetic north

relative to true north for any location that you

input. The link is as follows:

http://www.ngdc.noaa.gov/seg/geomag/jsp/Declin

ation.jsp

Note on Bubble Levels: It is possible to achieve

perfect polar alignment without having the pier

level, but it is slightly more difficult. With a pier

that is not level, each adjustment in azimuth also

causes a minor shift in altitude and vice versa.

This is why we have included the bubble level on

the Mach1GTO. Keep in mind that unless you are

a serious astrophotographer or imager, “perfect”

polar alignment is not critical.

We recommend that you do your rough polar alignment with the mount only since you will be making major adjustments to

the position of the mount at this time. The remainder of the equipment: telescope, finder, camera or eyepiece and

counterweights will add considerable weight and require more hand effort to make the adjustments. Later, you will do your

final polar alignment with the telescope and counterweights attached, but the adjustments will be small.

Note: The illustrations below show only the RA axis. This was done for clarity since the declination axis blocks the view into

the P

OLAR FORK BASE. You will, of course, be doing your rough alignment with the mount assembled.

1. If the Polar Scope (PASILL4 or earlier model) is installed, you may remove it to complete these steps.

2. Remove the P

OLAR SCOPE CAP (unless a polar scope was installed). If you examine the polar axis assembly, you

will see that the center of the R.A. shaft is hollow. Additionally, if you look at the dec axis, you will see that it has a

sliding cover (the S

IGHT HOLE / CABLE ACCESS COVER). By sliding this cover to the “open” position, you open a sight

line through the RA axis and out into the sky. For your rough alignment, you will peer through this sight tube and

attempt to center Polaris.

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