How accurate does my birth time need to be?

As precise as possible — even a 15-minute difference in birth time can shift which line of a Gate is activated, and in some edge cases can change your Type or Authority entirely, because the calculation depends on exact planetary ephemeris positions at that moment.

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If you don't know your exact time, check your birth certificate or hospital record first, or ask a family member — an approximate time (morning, afternoon, evening) still gives useful, mostly reliable information, since most people's charts don't sit right on one of the sensitive edge boundaries.

Related Questions

What happens if my birth time is wrong?
Depending on how far off it is, some Gate lines may shift, and in rarer cases your Type or Authority could come out different from your true chart.
Where can I find my exact birth time?
A birth certificate or hospital record is the most reliable source; a family member's memory is a reasonable second option.
Is an approximate time (like 'morning') useful?
Yes — it narrows things down meaningfully, even though it carries more uncertainty than an exact time for a handful of border-case Gates.