If the family remembers only "near dawn," a precise daily forecast rests on an uncertain chart. Zi Wei Dou Shu adds decade, annual and daily layers to the natal chart; adding detail does not fix a weak birth-time input.
Check the boundary
Compare a birth record, certificate and family memory. If the time sits near a two-hour boundary, make both candidate charts and record which palace positions change. Do not select a chart only because one past event sounds convincing.
Match precision to the question
A long-term career discussion and a claim that a contract will succeed next Tuesday require different confidence. Compare multiple dated life events and keep uncertainty visible. Legal, medical and travel choices still depend on their own evidence.