Saved birth details for the people you want to read alongside your own chart. Each place is resolved once, when you save it, and kept exactly as resolved.
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Leave blank if you do not know it. Without an exact time there is no Ascendant, no Midheaven and no houses, and the Moon's position becomes approximate — the Moon moves about 13° a day, which is further than the tolerances used to judge an aspect.
Be as specific as you can. Many city names exist in several countries, and you will be asked to choose rather than guessed at.