MDM Trouble Report for 2015 Nov 13

Telescope: 1.3m
Observer(s): Foord (University of Michigan)
Instrument: Templeton

Problem(s) Encountered:
Once again, around 3:30 my accurate pointing was gone! It was strange, because I 
was having no problem with the pointing all night.  The camera looking at the tilt sensors was very
helpful, and allowed me to successfully fix some smaller pointing issues earlier in the night.

Once I realized that the telescope was suddenly lost, I turned my tracking off and pointed to zenith.
I saw that my East/West tilt sensor was at 437, instead of the the usual -002.
This is the exact same problem I had last time (except last time my North/South
tilt sensor was off). Thus, I followed the directions you gave in your response
to my last trouble report:
I realized that my tilt sensors read 437 -006, when they should be
at -003, -008.
Moving the telescope to the zenith by zeroing the deviations seen in the tilt sensors
gave values around HA=00:23;00 dec=32:57:12
This is a big shift in my HA value, which is normally 0!
I pointed the telescope to zenith by the tilt sensor values, and then
drove east and started tracking. As I tracked through the 
nominal tilt sensor values I used the zero command to tell the telescope it was 
at zero.
These are the exact steps you did last time to fix my problem. However, this didn't seem to fix my problem.

I tried this method many times, and each time the ra and dec axes (after homed) still gave me the HA value of ~00:23:52.

I'm not sure why the pointing slowly got worse and worse through the night.
I did notice earlier in the night that when I was at  zenith  my HA
was slightly off, and in the middle of the night I realized it was at a 
pretty large value at zenith (00:17:00 at one point). It appears as if it was slowly moving further away from 
zenith during the night.

At least I got half a nights worth of data!

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Submitted on 2015 Nov 14 [4:10:26]