This is my first post, although I have been a long time reader.
I am using the almost constant overcast in Michigan to work on my skills finding objects in my Q 50th with the setting circles.
As I have attempted to use the setting circles, I am constantly confused over which part of the declination scale is positive and which is negative. I am in the northern hemisphere.
- After studying the telescope and working with it, I think the scales are signed as shown in the first attached figure. Is this correct?
- This (if I am correct above) brings up the fact that there are two settings for a given declination, one to the left and one to the right, as shown in figures two and three, where the declination is set to +70. They are the same declination, but 12 hours apart in RA. Which setting position (direction) is correct? How do you choose?
- I am looking at using the vernier scale produced by munirocks. That has a "+" on one side and a "-" on the other side, which further confuses me because I am thinking that both sides contain positive and negative declinations. For example, If I am facing south (I am at about 42 degrees North Latitude) I count down from positive to zero to negative declination, all on the same side.
- The lines on the vernier scale are very small and close together, and with my age and vision it is difficult to focus well at the close distance I need to view it. Is it possible to stretch out a vernier scale so that its lines are further apart?
I look forward to your answers.