Unknown birth times: Checking off "Time Unknown" instructs the program to leave out the Ascendant and house positions in the report, as these cannot be determined with any accuracy without a birth time.
Unknown birth times: Checking off "Time Unknown" instructs the program to leave out the Ascendant and house positions in the report, as these cannot be determined with any accuracy without a birth time. For most users, there is nothing special to do - the report is produced without the time-sensitive data.