a fragment of the world's largest ancient sundial of the jantar-mantar observatory

landmark architecture wall tower fragment largest ancient sundial jantar-mantar observatory world's marble surfaces divisions determine time high staircase blue sky background sun dial great observatory jaipur jantar mantar samrat yantra wandering division white marking stairs brihat unique steps marble sky instrument sandstone measurement unesco staircase famous observatories samrat site measure astrological jantar astronomical astrology india observation heritage clock astronomy sundial science time attraction historical blue historic landmark history ancient stone city travel