European sailors in the Bay of Bengal steered by a dark mass on the Odisha coast they called the Black Pagoda, paired with the whitewashed Jagannath Temple at Puri. It was the Konark Sun Temple, built around 1250 CE by King Narasimha Deva I of the Eastern Ganga dynasty as a literal chariot for the sun god Surya: 24 carved wheels nearly 12 feet across and seven straining stone horses, laid out on Vedic mandala geometry and aligned so equinox sunrise enters the main door. The wheels work as sundials accurate to about three minutes. Builders floated laterite, chlorite, and khondalite down monsoon-swollen rivers and fitted the blocks without mortar, then covered them with processions, daily life, and erotic mithuna sculptures.

What stands today is only the Jagamohana, the 39 meter audience hall. The main tower behind it, estimated at 70 meters, is gone, and its last piece fell in 1837. Copper plates from 1384 and Abul Fazl’s Ain-i-Akbari show the temple was finished and active, so historians weigh salt weathering, an attack linked to Kalapahad around 1568, and abandonment after desecration. Later, the Marathas moved a 33-foot pillar to Puri, a local raja stripped stone for his own buildings, and British collectors dragged sculptures off and left some by the roadside. In 1903 Lieutenant Governor J. A. Bourdillon had the hall sealed and filled with sand to stop its collapse, and in 2022 the Archaeological Survey of India began removing it.

• How the wheels tell time: 8 major and 8 minor spokes, with 30 beads splitting each 90-minute span into 3-minute steps
• The meaning behind the numbers: 24 wheels for the waxing and waning halves of 12 months, 7 horses for the days of the week
• A relief showing King Narasimha smaller than his guru, with his sword resting on the ground
• Why Victorian officials labeled the mithuna carvings pornography and missed their place alongside dharma and artha
• The Konark wheel on India’s 10 rupee note and Tagore’s line that here the language of stone surpasses human language