22
Polaris
URSA
MINOR
URSA
MAJOR
DRACO
CEPHEUS
The Four Stars
Polaris
Rotate
40’
60’
Polaris
Not Aligned
40’
60’
Polaris
Aligned
Fig. 3b
Image on polar viewfinder will be inverted.
Fig. 3a
Polar Viewfinder Reticle (for Northern Hemisphere Only)
Precision Polar Alignment - The Drift Method
Using this method, azimuth and altitude are adjusted separately until the effects of star
drift are eliminated. This method is good for Northern and Southern Hemisphere users.
• Azimuth adjustment
Select a star on the celestial equator and meridian (i.e., Hour Angle = 0° and Dec. = 0°).
• If, over time, the star drifts S in the eyepiece then the southern end of the polar axis is pointing
East of the Celestial Pole.
•If the star drifts N then the southern end of the polar axis is pointing West of the Celestial Pole.
• Altitude adjustment
Select a star in the East (and/or in the West) low on the horizon and in the southern hemisphere of the
Dec. = 0º.
• If the star in the East drifts N the elevation is too low.
• If the star drifts S the elevation is too high.
For more information on Polar Alignment on the Southern Hemisphere, visit Astronomical Society of
South Australia website at
www.assa.org.au/resources/equipment-reviews/polar-alignment/
Southern Hemisphere users will need a crosshair reticle eyepiece. Available at astronomy shops.
EXOS II MOUNT SET UP / POLAR ALIGNMENT PROCESS
8
Summary of Contents for PMC-Eight
Page 1: ...Instruction Manual June 2017...
Page 23: ...23 NOTES...
