Why is birth time essential for Lagna?
Because the ascendant changes quickly, often within a couple of hours. Even a small birth-time error can change the Lagna and house layout.
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Lagna
Lagna is the ascendant, the sign rising on the eastern horizon at the exact time of birth. It sets the house structure for the entire horoscope.
If Rasi shows the emotional lens, Lagna shows the life path frame. It influences health, personality expression, appearance, and how the twelve houses are distributed in the chart.
Astrologers use Lagna to understand bodily constitution, timing, house rulerships, and major life themes. Two people can share the same Rasi but have very different lives because their Lagnas are different.
Lagna is not interchangeable with Rasi. Rasi is the Moon sign; Lagna depends on the precise birth time and changes much faster.
Because the ascendant changes quickly, often within a couple of hours. Even a small birth-time error can change the Lagna and house layout.
Both are important for different reasons. Lagna frames the life structure, while Rasi is heavily used for emotional reading and day-to-day prediction.