Short
Why astrologers ask your exact birth time
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A new sign rises in the east about every two hours. The one rising at your birth is your lagna, and every house is counted from it.
This video belongs with The First House (Lagna) in Astrology: Self, Body and Beginnings, which has the full explanation and its classical sources.
Transcript
Why does an astrologer ask for your exact birth time? Because of your lagna. As the Earth turns, a new sign rises on the eastern horizon about every two hours. The sign rising when you were born is your lagna, and every house in your chart is counted from it. So two people born on the same day, in the same city, four hours apart, have completely different charts.
Find your lagna with a free kundli at sunyra.ai.
Astrology is a tradition of interpretation; read this as guidance, not a forecast. Disclaimer.