Manual docking requires astronauts to have a precise judgement on the relative distance between ShenzhouIX and the Tiangong-1 module, a challenge to their capability of coordination, accuracy and psychological stability.
If all goes according to plan, the ShenzhouIX space craft should be re-connected manually to Tiangong by Sunday morning, marking a giant leap for Chinese space travel and the first stages in a permanent space station within the next 8 years.