Chart
Three facts fix a sky: the day, the hour and the place. The more exact the hour, the more exact the houses.
Day, month and year.
As exact as you have it. Without a time, Astro places the planets at local noon and does not draw houses or the rising sign.
Town or city, and country. Choosing a suggestion looks the place up through OpenStreetMap Nominatim — a network request for coordinates only. The chart is calculated in this browser afterwards, and is not sent to us.
Filled when you pick a place. You may enter them yourself instead of using Nominatim.
The natal calculation runs in this browser with astronomy-engine. Place lookup is a Nominatim network call for coordinates only. Birth facts are not sent to Google.