Immediately south of the City Palace lies the remarkable Jantar Mantar, a large grassy enclosure containing eighteen huge stone astronomical measuring devices constructed between 1728 and 1734 at the behest of Jai Singh, who invented many of them himself. Their strange, abstract shapes lend the whole place the look of a weird futuristic sculpture park. The Jantar Mantar is one of five identically named observatories created by the star-crazed Jai Singh across north India, including the well-known example in Delhi, though his motivation was astrological rather than astronomical.

It’s a very good idea to pay for the services of a guide to explain the workings of the observatory, which was able to identify the position and movement of stars and planets, tell the time and even predict the intensity of the monsoon. Probably the most impressive of the observatory’s constructions is the 27m-high sundial, the Samrat Yantra, which can calculate the time to within two seconds. A more original device, the Jaiprakash Yantra, consists of two hemispheres laid in the ground, each composed of six curving marble slabs with a suspended ring in the centre, whose shadow marks the day, time and zodiac symbol – vital for calculating auspicious days for marriage.

Travel offers; book through Rough Guides

India features

The latest articles, galleries, quizzes and videos.

19 places to get utterly lost

19 places to get utterly lost

One of the great joys of travelling is stumbling across unexpected places, wandering without a single destination in mind and embracing the journey. These place…

12 Sep 2017 • Keith Drew camera_alt Gallery
The most beautiful country in the world – as voted by you

The most beautiful country in the world – as voted by you

There's nothing like an amazing view to inspire you to book your next trip, whether you're drawn by rolling countryside, isolated islands or soaring mountain …

30 Aug 2017 • Rough Guides Editors camera_alt Gallery
13 tips for backpacking India

13 tips for backpacking India

Whether you’re hurtling along in a rickshaw, eating fantastic curries, kicking back on the backwaters or hiking in the mountains, backpacking India will alwa…

15 Aug 2017 • Helen Abramson insert_drive_file Article
View more featureschevron_right

Join over 60,000 subscribers and get travel tips, competitions and more every month

Join over 60,000 subscribers and get travel tips, competitions and more every month