An annotated copy of Porter's script for 'The Night Sky in April' on the astronomers of the past and the discovery of the rings and satellites of Saturn; Leo, Spica in Virgo with Saturn to the east, and the appearance of Saturn in a telescope; the quality of early telescopes, such as those of Galileo and Huygens; Huygens's telescope, his observation of Saturn and discovery of Titan, the largest moon of Saturn, Cassini discovering four moons and Herschel discovering two more; the arrangement of the orbits of these satellites, Iapetus in captured rotation and Phoebe in retrograde revolution; and Huygens on space travel.