The
most striking instrument is the Brihat Samrat yantra Sundial, an imposing yellow
edifice to the far right of the observatory complex which has a 27m high gnomon
arm set at an angle of 27degree.The shadow this casts moves up to 4m in an hour,
and aids in the calculation of local and meridian pass time and various attributes
of the heavenly bodies, including declination the angular distance of a heavenly
body from the celestial equator and altitude. This highlight of the observatory
has made it a centre of attraction for the tourist visiting Jaipur.
Across the road from the palaces is the famous JANTAR MANTAR one of the five
observatories in India . Built by Sawai Jai Singh, this is one of the largest
and the best preserved. A passionate hobby of the king in the field of Astronomy,
numerology, insighted him to execute this observatory and with the help of skilled
labourers, they managed to create a collection of complex astronomical instruments
chiselled out of stone and most of which continues to provide accurate information
to this day.
Jantar Mantar is the most famous and elaborate observatory of its time. It was
constructed in the year 1724 A.D. by Sawai Jai Singh II, even before the city
of Jaipur was built, and has been described as the most surrealistic and logical
landscape instone. It was built to measure the local time, the sun's declination,
altitude, the declination of stars, planets and to determine eclipses.