I believe that for many friends who play with astronomical telescopes, the polar axis has always been an annoyance. Especially students who are just getting started, do not know how to use software, and do not have electronic equipment, even more at a loss.
It is very cheap to buy a polar mirror, but the polar mirror also has a dial, and there are coils in the field of view of the polar mirror.
Today I will introduce to you the simple way to use the lower polar axis mirror dial. It takes half an hour to align the polar axis, and then the polar axis can be roughly aligned in 10 seconds without dragging the line blindly for 3 minutes.
1. Coaxial alignment of polar mirror and equatorial right ascension (very critical)
Observe a small spot through the central crosshair of the polar mirror, and then rotate the right ascension axis, you will find that the small spot is off, indicating that the polar mirror and the right ascension axis are not on the same axis. While adjusting the three screws on the polar mirror, turn the right ascension axis until the center crosshair of the polar mirror keeps aiming at the small target no matter how it turns.
2. Know the dial
The large dial is a time dial, 24 hours, 10 minutes per small division. The smaller one is the date plate, which is 12 months and 1 day per cell.
Align the 0 mark of the large dial with the white arrow on it, and tighten the screw to keep it still.
3. Use the software to determine a local time point and the location of the North Star at that time
Because the polar mirror is a Galileo refractor, what you see is upside-down, just as if the Polaris is directly below. Rotate the right ascension axis so that the small circle (polaris) in the polar mirror is at the lowest end of the field of view. You can find a house for reference. When you use it at night, just turn the right ascension axis so that the date dial of the time dial corresponds to your time at that time (don't touch the dial), and then adjust the elevation and azimuth of the equatorial mount so that the North Star falls into a small circle.
My method may not be precise, but after taking it seriously, it will be very convenient to use in the future. It is a good news for beginners.
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