A snap shot of one of the staircases at the Jantar Mantar in Delhi.
"This structure was, 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.
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 astronomy."
-Quoted from Wikipedia
For the entire background on the structure visit this link: [link]
Earlier, before the massive growth of New Delhi you could even tell the easily just by glancing at where the sundial's shadow felt, alas now with so many high rises around it's been rendered pretty ineffective these days.
However, it does offer many opportunity for good abstract photographs thanks to it's symmetric structure.