iOptron 8504 ユーザーズマニュアル

 
 

13

time zone). Enter minutes “ahead of” or 
“behind” UT (universal time). The minimum 
time difference is 60 minutes. 

•  New York City is 300 minutes “behind” 

UT 

•  Los Angeles is 480 minutes “behind” UT 

•  Rome is 60 minutes “ahead of” UT 

•  Beijing is 480 minutes “ahead of” UT 

•  Sydney is 600 minutes “ahead of” UT 

All the time zones in North America are 
behind

 UT, as shown in the following table. 

So make sure it shows “behind” instead of 
“ahead of” UT.  

Time Zone 

Hours 

behind UT 

Enter 

Minutes 

Hawaii -10  600 

Alaska -9  540 

Pacific -8  480 

Mountain -7 

420 

Central -6  360 

Eastern -5  300 

To adjust minutes, use the ◄ or ► key to 
move the cursor, and the ▲ or ▼ button to 
change the numbers. To change the 
“behind” or “ahead of”  UT, move the cursor 
to “ahead of” and using ▲ or ▼ key to 
toggle between “behind” and “ahead of”. 
When the number is correct, press ENTER 
and go back to the previous screen.  

For other parts of the world, you can find out 
your “time zone” information from internet, 
such as 

http://www.timeanddate.com/worldclock/

. 

DO NOT COUNT DAYLIGHT SAVING 
TIME. 

If a GPS module is connected to the E-
mount, the local time, longitude and latitude 
information will be received from satellites 

after the link is established. Only Daylight 
Time Saving and Time Zone settings are 
needed. However, the local time and site 
info also can be manually entered in case of 
GPS malfunction or testing the mount 
inside. It is always a good idea to do your 
home work to get the GPS coordinates 
before traveling to a new observation site.  

A clear sky outside is needed for GPS to 
communicate well with the satellites. 

1. Always begin viewing with the lowest 
power eyepiece. (Note: a 25 mm focal 
length eyepiece has a lower power than a 
10 mm one.) A formula can be used to 
determine the power of each eyepiece: 
Telescope focal length divided by eyepiece 
focal length equals magnification. Ex. 
400mm ÷ 25mm = 16X (magnification) 

2. A 45° Erecting Diagonal Prism is included 
in the R80 or MC90 telescope. The Erecting 
Diagonal Prism is used to erect the image 
you will see. Astronomical telescopes are 
designed in such a way that the image you 
see may be UPSIDE DOWN and 
REVERSED. This is perfect for viewing 
celestial bodies. However, it will feel strange 
when observing a land object or a bird. 

1. After selecting the desired eyepiece aim 
the telescope tube at a land-based target at 
least 200 yards away (e.g. A telephone pole 
or building). Fully extend focusing tube by 
turning the focus knob. 

2. While looking through selected eyepiece, 
slowly retract focusing tube by turning 
focusing knob until object comes into focus. 

1. Look through Main Telescope Tube and 
establish a well-defined target (see focusing