1.) Birthplace is based on coordinates, technically, but the location by city (or nearest population center) is best.
2.) An approximate time would be fine, and if you don't know the time of birth at all then it can be done, but with substantially less accuracy to you as a person.
Specifically, there are three types of objects in a chart without including the angles between those objects: Planets, Signs, and Houses.
The Planets and Signs will be normal, as will the angles between them. But anything involving the Houses will be impossible to know.
Since everything interacts, this is an exponential lessening of the accuracy.
Still, I base most of my work on just the things that are really powerful, and they rarely require the Houses to be identified.
~ David
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