Nari Valâya Uttar Gola YantraiSouthern Hemispherical Sun-Dial)
in the Jaipur Observatory (Jantar Mantar)
Its rear is the Northern Hemispherical Sun-Dial, turning from side to side.
The circular surface makes 23.5 degrees from the perpendicular,
expressing both the Northern or Southern Hemisphere.
A small central stick casts a shadow to indicate the time
from the vernal equinox to autumnal, or vice versa.