Jantar Mantar New Delhi

The Yantra Mantra (literally the 'instrument and formula' and often called the Jantar Mantar), is located in the modern city of New Delhi, Delhi. It consists of 13 architectural astronomy instruments, built by Maharaja Jai Singh II of Jaipur, from 1724 onwards, and is one of five built by him, as he was given by Mughal emperor Muhammad Shah the task of revising the calendar and astronomical tables. There is plaque fixed on one of the structures in the Jantar Mantar observatory in New Delhi that was placed there in 1910 mistakenly dating the construction of the complex to the year 1710. Later research, though, suggests 1724 as the actual year of construction.
The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. Some of these purposes nowadays would be classified as astrology. 

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The 2010 Commonwealth Games is the 19th Commonwealth Games, and the ninth to be held under that name. The Games are being held in Delhi, India, from 3 to 14 October 2010, the largest multi-sport event conducted to date in Delhi and India, which hosted the Asian Games in 1951 and 1982. The opening ceremony took place on 3 October at the Jawaharlal Nehru Stadium, the main stadium of the event. This marks the first time the Commonwealth Games have been held in India and the second time the event has been held in Asia (after the 1998 Games in Kuala Lumpur, Malaysia).

Initially, several concerns were raised over the preparations of the Games and these included heavy rains and possibility of floods in Delhi, infrastructural compromise, poor living conditions at the Commonwealth Games Village, delays in construction of the main Games' venues, the withdrawal of prominent athletes,  and widespread corruption by officials of the Games' Organising Committee. Despite these concerns, all members of the Commonwealth of Nations participated in the Games. A widely-praised opening ceremony helped improve the image of the games. After the progress of the first few days of competition in various disciplines, the focus has returned to sport. However, the ticket sales for some of the sporting events have been exceptionally low.