Jantar Mantar, Jaipur historical timeline

Jantar Mantar grew from Sawai Jai Singh II’s attempt to reconcile different astronomical tables and observation traditions. The Jaipur observatory was one of five he established in north India and became the largest and most complete of the surviving group.

Chronology

1. Early 18th century Jai Singh studies discrepancies in astronomical tables and gathers scholars familiar with Indian, Persian-Islamic and European approaches.
2. 1727 Jaipur is founded as a planned capital. The observatory is placed beside the palace, giving scientific observation a central position in the royal city.
3. 1728 Construction of the Jaipur instruments begins, building on experiments at Jai Singh’s earlier Delhi observatory.
4. 1734 The principal Jaipur ensemble is completed. Large fixed instruments use carefully oriented planes, arcs and sighting surfaces to increase the scale of naked-eye measurement.
5. 19th century Regular use declines and exposure damages plaster, scales and surfaces. Later repair campaigns seek to restore legibility and working alignment.
6. 20th century Conservation and renewed scholarly study establish the observatory as both a monument and a history-of-science site.
7. 2010 UNESCO inscribes Jantar Mantar, Jaipur, under criteria (iii) and (iv), recognising its scientific traditions and architectural expression of astronomical instrumentation.

Authenticity and repair

The masonry masses are original historic structures, but precise readings depend on fine surfaces, scales and calibration that have required intervention. UNESCO therefore treats conservation of material and instrumental function as a continuing challenge, not a finished restoration story.

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