Why time matters
The zodiac moves across the horizon throughout the day, and the Ascendant often changes signs about every two hours. Minutes can matter near a sign boundary.
Why place matters
The horizon is local. Latitude and longitude change which point of the ecliptic is rising, so birthplace coordinates are part of the calculation.
How astrologers read it
Traditionally the Ascendant describes orientation, embodiment, and how a person meets new situations. It also begins the first house and helps determine the chart ruler.
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