jaya prakash yantra - an astronomical instrument at ancient observatory, jantar mantar, jaipur, rajasthan, india

altitudes ancient angles architecture astronomical astronomy azimuths bodies celestial declinations details equinoctial geomerty geometrical giant group heavenly hemisphere hemispheres hemispheric heritage hour huge india instrument instruments jaipur jantar jaya large mantar measurement monument observatory planetary planets position positional posts prakash ptolemaic rajasthan shaped sky stellar stone structure sunken system wall yantra zodiac