The 63rd parallel south is a circle of latitude that is 63 degrees south of the Earth's equatorial plane. It crosses the Southern Ocean and Antarctica.
At this latitude the sun is visible for 20 hours, 19 minutes during the December solstice and 4 hours, 42 minutes during the June solstice.
63rd parallel south Wikipedia
Starting at the Prime Meridian and heading eastwards, the parallel 63° south passes through: