The type of astrology that most western astrologers practice, horoscopic astrology, requires an exact birth time in order to work properly.  That is to say, you need the time of a person’s birth in order …

An important concept in the Hellenistic astrological tradition that did not survive into modern times is the distinction between day and night charts, which is associated with a technical concept known as “sect.”
In this article …

In addition to the basic significations of each the seven visible planets, each is also assigned a somewhat intrinsic status as a natural ‘benefic’ or ‘malefic’, or a planet may attain such status functionally due …