When your birth time is unknown, it significantly impacts the accuracy and detail of a birth chart for several reasons:

• Ascendant Sign Unknown: The Ascendant (or Rising Sign) is the zodiac sign that was rising on the eastern horizon at the time of birth. It's crucial for determining the houses in a chart. Without a birth time, the Ascendant cannot be accurately determined.
• House Positions Uncertain: Astrological houses represent different areas of life and are calculated based on the time of birth. Without a birth time, the placement of planets in houses cannot be determined, which affects interpretations related to aspects of life like career, relationships, and personal growth.
• Moon Sign Ambiguity: While the Moon sign can often be determined without a birth time, if the birth occurred on a day the Moon changed signs, the exact sign may be uncertain without the birth time.
• Aspect Angles May Vary: Precise angles (aspects) between planets can indicate specific dynamics and themes in a person's life. Without a birth time, the accuracy of these angles can be compromised, especially for fast-moving planets.