Hubble is in a low-Earth orbit so that it can be reached by the space shuttle for servicing missions, but this means that most astronomical targets are occulted by the Earth for slightly less than half of each orbit.. 
Bach di kàntor ti ilé -ìwé Thomas ní Leipzig ní Oṣù karùn ọdún 1723 ó sì ṣe iṣé náà títí ó fi kú.. 