The alarm clock app gives you the time of the start of the transfer window. Not sure how the size of the window is defined, but it's a period of multiple days. The best possible second to launch will be different than the time the alarm gives you, because the alarm only tells you when the window starts, and the best possible time is somewhere in that window. In practical application, for all bodies other than Moho it doesn't really matter if you're a day or two off of 'perfect'. You'll stil