<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'> No it should move later by about three hours to 4:30am local. Hubble flights are about 28-31 minutes earlier each subsequent day. <br />Posted by Betsy</DIV><br /><br />That might apply to an ISS mission, where launch is predicated on the plane of the orbit passing overhead. </p><p>For the HST, which is in a perfect KSC inclination orbit (~28 degrees inclination) I don't think that rule applies. It's in a near circular, 565 km orbit. The orbital period is ~ 95.84 minutes per orbit. Much higher than the ISS, and also slower than the ISS. Since the Shuttle launch will be mush higher than any of the last few dozen missions, I don't know how best to manage that. So the launch time will be dictated by the efficient use of the launch energy.</p><p>There's a LOT of EVA time for the mission, so the sooner they get there, the more slack time there is. It all depends on what the mission primary parameters are. Until I hear from s_g or NASA, I won't even speculate.</p> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>