With an off axis guider the autoguider will compensate for this movement, but with a guide scope the mirror movement can not be compensated for. The only fix is to lock the mirror down so it does not move at all relative to the rest of the telescope.
HZ travel tools > Time zones, world clock > Time difference calculator > Sydney time to London. Time difference between Sydney, Australia and London, UK is: -9:0 hours. Sydney is 9:0 hours ahead of London. That means when it is 8:00 am in London, it is 5:00 pm in Sydney. Daylight Saving Time (DST) / Summer Time is taken into account for all time difference calculations on this page.
From the 1st Sun. of Oct. until the 1st Sun. of Nov., Sydney is 15 hrs. ahead of New York. The time difference between Sydney, NSW (Australia) and New York City, NY (USA) is 16 hours. Sydney time is 16 hours advance than NYC time. For example, if its 6:53 PM, Monday, December 31, 2007 in NYC, then its 10:53 AM, Tuesday, January 1, 2008 in Sydney. The time difference changes depending on the time of year. Australia experiences Daylight Savings Time (DST) just as the US does, but not on the same days.