Scheduler -> Help -> Contents -> Detailed Description -> Scheduling Concepts -> description of "Plan"

I'm trying to be a good new user by doing as much RTFM (read the fine manual) as possible... it's problematic when the manual is wrong.

Not being able to automatically try failed plans again on the same night might be show-stopper for me. I see zero downside to the scheduler having another go at a failed plan if it has nothing else to do.

Here's a log from one of the failed observations:

ACP console log opened 09-Aug-2020 03:16:19 UTC
This is ACP version 8.3 (build 1, Release 8.3)
Unlicensed copy - 30 day demo mode
Licensed to
03:16:19 This is AcquireScheduler V8.2.8
03:16:19 Custom image file path/names are in use
03:16:19 [PreFlip=-1800 PostFlip=120 AF=180 PU=60]
03:16:19 Hardware GEM pier side reporting is available.
03:16:20 Initializing AcquireSupport V8.3.1
03:16:20 Weather safe, server is Boltwood Cloud Sensor II
03:16:20 Telescope is ACP->Takahashi FSQ-106 EDX4, driver V3
03:16:21 MaxIm DL is version 6.22
03:16:21 Imager is SBIG Universal
03:16:21 Using focus offsets and star mags from FilterInfo.txt
03:16:21 Selecting filter L from previous ACP run at 20200809@031258 UTC
03:16:21 Imager readout modes:
03:16:21 0 is Raw
03:16:21 1 is Raw w/RBI pre-flash
03:16:21 Guider is DL Imaging (rotated off-axis)
03:16:21 Guider plate scale is 1.9 arcsec/pix. Guided dither with main imager pixels
03:16:21 Max unguided exposure 30 sec.
03:16:21 and exposure agregation is disabled
03:16:21 (assuring that FocusMax is running now...)
03:16:26 Calculated unbinned plate scales (arcsec/pix): H = 3.50 V = 3.50
03:16:26 Calculated field of view (arcmin): H = 238.8 V = 238.8
03:16:26 Plate solving with GSC 1.1 (ok for wider fields)
03:16:26 Mount supports tracking rate offsets
03:16:26 Imager rotator support enabled
03:16:26 ACPS Observation Blue Horsehead RGB Moon Test(1 of 1)
03:16:26 (belongs to Project Blue Horsehead, Plan Blue Horsehead Moon Test)
03:16:26 (turning on sidereal tracking)
03:16:26 Pointing updates are enabled
03:16:26 Start slew to Blue Horsehead RGB Moon Test...
03:16:28 Start rotate to PA 247.0 deg (raw rotator angle 337.6)
03:16:28 (wait for slew to complete)
03:16:57 (slew complete)
03:16:57 (wait for rotator)
03:19:52 (rotation complete)
03:19:52 [flip check: Tn=-1440s HAc=4361s GW=T HAz=2849s DWz=T WF=no]
03:19:52 Doing auto-center...
03:19:52 (taking 2 sec. exposure, L filter, binning = 1)
03:19:52 (using Raw readout mode)
03:19:52 (starting [RBI] + exposure)
03:19:55 (exposure complete)
03:20:00 (exposure complete and image downloaded)
03:20:01 Image finished
03:20:01 Plate-solve pointing image.
03:20:01 63 image stars found
03:20:01 275 catalog stars found
03:20:03 ** No matching stars found. Check your estimated center-point RA/Dec, and your image scaling and quality.
03:20:04 Start slew to offset...
03:20:05 (wait for slew to complete)
03:20:13 (slew complete)
03:20:13 (taking 2 sec. exposure, L filter, binning = 1)
03:20:13 (using Raw readout mode)
03:20:13 (starting [RBI] + exposure)
03:20:17 (exposure complete)
03:20:21 (exposure complete and image downloaded)
03:20:23 Image finished
03:20:23 Plate-solve pointing image.
03:20:23 58 image stars found
03:20:23 399 catalog stars found
03:20:25 ** No matching stars found. Check your estimated center-point RA/Dec, and your image scaling and quality.
03:20:25 Start slew to Blue Horsehead RGB Moon Test...
03:20:26 (wait for slew to complete)
03:20:32 (slew complete)
ACP console log closed 09-Aug-2020 03:20:33 UTC