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Why Birth Time Is the Hardest Input to Handle in Astrology Chart Software

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A developer building a birth-chart engine found that the trickiest bugs stemmed not from zodiac logic but from handling birth time inputs accurately. Issues arose from ambiguous local times during daylight-saving transitions, where the same clock time can map to two different UTC instants, or from times that never existed when clocks spring forward. Rather than silently defaulting unknown birth times to noon, the developer treated unknown time as an explicit engine state, omitting time-dependent fields like the Ascendant and house cusps instead of returning fabricated values. The engine also flags fields with genuine uncertainty, such as the Moon's position near a sign boundary, rather than presenting false precision. The developer argues that timezone handling and missing-time behavior are product experience concerns, not just backend details, and that user-facing trust messages should reflect real engine constraints.

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Why Birth Time Is the Hardest Input to Handle in Astrology Chart Software · ShortSingh