Birth chart
A map of where the Sun, Moon and planets were, seen from the exact place and minute you were born.
Imagine standing where you were born, at the minute you arrived, and photographing the whole sky — including the half under your feet. Flatten that photo into a circle and you have a birth chart (astrologers also call it a natal chart).
Every planet sits in a sign (the style it works in) and a house (the area of life it shows up in). The angles between planets, called aspects, describe how those parts of you get along.
Nothing here is guessed. Horozy calculates every position from the same astronomy observatories use.