Although we are Space Engineers that talk with satellites everyday, we still can forget that January has 31 days. I just updated my post "When will SPOT4 observe my site ?", because the day 1 of Take 5 cycle will not be February the 1st, but January the 31st. If you had planned in-situ measurements simultaneously to the satellite overpass, you will need to reprogram them one day earlier. Our deepest apologies !