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How One Developer Built a 237-Endpoint Vedic Astrology API and the Bugs Found Along the Way

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A developer recently published a technical retrospective on building GrahaAPI, a REST API covering 237 endpoints across 23 modules of Vedic astrology with bilingual Hindi and English responses. The project surfaced a subtle thread-safety bug in the underlying C ephemeris library, where FastAPI's threadpool silently defaulted new threads to tropical zodiac mode instead of sidereal, returning plausible but astronomically wrong planetary positions with no errors. To validate accuracy, the team built regression tests anchored to centuries-old classical invariants — such as Vimshottari dasha periods summing to exactly 120 years and fixed choghadiya sequences — treating any test failure as a code defect, never a test flaw. One such test caught a time-formatting bug where 59.57 seconds was rounded to 60 without carrying over into the next minute, displaying 07:59:34 as 07:00. The post highlights how legacy domain knowledge with frozen specifications can serve as unusually reliable test fixtures for modern software systems.

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