Why birth-time accuracy changes houses and angles
Understand UTC offsets, daylight-saving history and the honest limits of unknown times.
The sky is time-sensitive
Planetary signs often change slowly, but the Ascendant, Midheaven and houses depend strongly on time and location.
Use historical offset
A modern phone’s current time zone is not enough. Use the UTC offset and daylight-saving rule that applied at the recorded date and place.
Name uncertainty
If the time is unknown, avoid confident house and angle claims. A noon chart can explore planets and some aspects while clearly marking the limitation.