There are different methodologiesI wanted to get my mom's, but she doesn't know her time of birth
and it's not on her birth certificate.
How should you go about getting an accurate chart?
She should check with the jurisdiction (like the county or city) and its office that holds vital records like birth and death certificates to find out what they have on file. Sometimes they issue a simple birth certificate card to the individual, but actually have a longer record on file.