The bottom line is the Local Sidereal Time (LST) of the mount has to be correct.
If the LST is incorrect in either the Mount or in ASIAIR, then the location of the Meridian will be off. Auto Meridian Flips (and even manual Meridian Flips) will not work correctly.
Check the LST on the hand controller. If it is correct, you are good to go since we can assume LST is correct in ASIAIR.
If you cannot find LST on the hand controller, check the UTC and the Longitude on the hand controller. If those two are correct, then LST is correct.
On iOS, UTC and Longitude are always correct as long as the GPS in the iPad is working. Therefore, ASIAIR's internal time should be independent of DST setting, since it should not even be using local time.
It is trivial to confirm that the LST on ASIAIR is correct by pointing to a star that has not yet reached Meridian. Perform a fake AutoRun and see what ASIAIR reports as the time before the Meridian Flip. Then check with a planetary program for when the Meridian flip should occur.
The problem occurs when the mount does not have the correct UTC and longitude. The mass market mounts don't like to confuse their customers, and usually use local time instead of UTC to set up time. That is where UTC offsets and Daylight Saving Time become the source of confusion.
If the mount cannot establish its time, you have to push Date and Time information from the ASIAIR to the mount. When you do that, ASIAIR will be pushing a Local TIme to the mount, with the assumumption that DST on the mount is turned off.
Longitude comes into play when you compute LST from UTC.
Because ZWO is so hell bent not to make its user learn the concepts of astronomy, you don't find LST mentioned anywhere in the ASIAIR's GUI, even though LST is the first concept one learns in an introductory astronomy class.
Fortunately, there are plenty of apps at the Apple App Store that can display LST. LST is also available in planetary programs. SkySafari displays it in the Date and Time setup under the Advanced tab. Any of those sourses wil confirm if the LST shown in the hand controller is correct.
Again, check LST on the mount -- if it is accurate and if the mount is aligned ("star aligned" if the motors don't have absolute encoders), the mount should point to the correct location that ASIAIR commands the mount to point to.
Chen
