Location: Jantar Mantar of Jaipur finds its place adjacent to the City Palace. This is an observatory that was constructed in the first half of eighteenth century somewhat between 1728 and 1734.
Description: Construction of this structure has been done with marble and local stone. Each and every instrument present here has an astronomical scale which is commonly marked on the inner lining of the marble. The person behind the construction of this observatory was Maharaja Jai Singh II. This observatory is considered to be the largest stone observatory in the world. Well known for the solid geometrical figure, this observatory serves as a house for around fourteen main solid and fixed geometric instruments which help in tracing the stars and their orbits. Year 1948 saw Jantar Mantar being declared as a national monument. This observatory serves as a wonderful blend of art and science. Overall it provides an understanding of the efficiency of architects and the knowledge of science that people of ancient times had.
Activities: Jantar Mantar helps in determining time as well as eclipses; it finds out the altitudes and computes time. Although it is an old system of doing so and now modern methods are available, still it is an exemplary place to understand the relationship between mathematical calculations and movement of the various cosmic bodies.