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1. February 15, 16LT Sun altitude SNO-T art horizon, Caro syrup+oil:
IC=-0.5,
Errors: 0.8, 0.2, 0.1, 0.1, -0.2, 0.3, 0.0, 0.2.
Average error: 0.18, sigma=0.3

2. Same, MkIXa, no averaging.
Errors: -3.6, -4.3, -3.7, -4.8, -3.6, -1.4, -3.2, 6.8, -0.6, 5.2
Average error: -1.22, sigma=4'.0

(You can notice the switch from negative to positive errors
after the 7-th observation.
This happened when I had to push the "increase knob".
So there might be some instrumental error related to
this knob action.)

3. Now averager is on: GMT: 21:25:45 (end of observation) sextant
reading: 19d16',
error 1'.7

4. February 16 (GMT date), Sirius altitude, MkIXa, no averager:
GMT:        Alt:             Error:
2:04:55    31d57'         -0.4
2:07:10    31d54'         -4.0
2:09:25    32d05'          1.7
2:10:45    32d09'          2.7
2:12:00    32d13'          4.0
Average error: 0'.8, sigma=3'

5. Averager is on (Sirius): GMT=2:20:10, alt=32d24, Error 0.93.

These results are more typical than the one I posted first.
I mean 4-6 minutes errors frequently happen in individual
observations.
They are usually canceled by averaging, manual or automatic.
I suppose that the first observation I posted two days ago was so good
by pure coincidence.

Alex.


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