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.

Book through Rough Guides’ trusted travel partners

India features

The latest articles, galleries, quizzes and videos.

India: 8 hill stations where you can escape the heat

India: 8 hill stations where you can escape the heat

April, May and June are the hot and sticky months that lead up to monsoon season in India – but don’t let the soaring temperatures put you off visiting. Hil…

27 Apr 2018 • Rachel Mills
The world's quirkiest food festivals

The world's quirkiest food festivals

Tomato-drenched crowds wading through a lake of passata at Valencia’s La Tomatina festival might be a familiar image, but such passionate and eccentric cele…

22 Dec 2017 • Lucy Cowie insert_drive_file Article
Living the past: the ancient professions of Old Delhi

Living the past: the ancient professions of Old Delhi

Modernity is seeping into Old Delhi, a walled district that has long harboured the Indian capital’s traditional ways of life. But what does this mean for long…

11 Dec 2017 • Jack Palfrey local_activity Special feature
View more featureschevron_right