Next message: Alexandre Eremenko: "Re: Visit to Freiberg"
Alex
That is good news, and confirms my guess that the SNO-T would be approx.
plus/minus 9-seconds accurate along the arc. It also means the discrepancy
you measured around 50d with the SNO-T was backlash or (operator error ;-).
Approx. 0.3' to .04' backlash if memory serves. Wow!
Interesting that your IC was zero, which matches the arc error at 0d. I am
surprised the backlash problem did not show up in your IE checks. If spring
loaded, the backlash should be almost consistent along the arc-- 0d, 50d, or
90d.
Bill
>> Is the 4" plus minus along the arc?
>
> The table of correction is
> 0 10 20 30 40 50 60 70 80 90 100 110 120
> 0 -4 -4 10 6 -1 4 5 -5 4 4 3 14
> The first line in degrees, the second one in seconds.
> When rounde to tenths of minutes
> it never exceeds 0.1' except 2 times
> when it is roughly 0.2'
>
> The errors I had in star distances are usually larger,
> and always positive. In principle they can be attributed to backlash,
> but I never measured anything after the sextant test.
