Accuracy first — every position comes from DE440, NASA JPL's most precise planetary ephemeris.
Accuracy first — every position comes from DE440, NASA JPL's most precise planetary ephemeris.
Indu Lagna is a point counted from the ninth lords of your Lagna and your Moon — a classical indicator of accumulated prosperity, and separate from the ascendant itself.

Why your birth time matters
Indu Lagna is counted from the ninth lords of both your Lagna and your Moon, and the Lagna moves a whole sign every two hours — so an imprecise time can land it on a different sign.
What you'll get
The ninth house is bhagya — fortune — and Indu Lagna takes its ninth lord twice over: once from the Lagna and once from the Moon. Using both means the result depends on the chart as a whole rather than on a single reference point, and it is why two people with the same ascendant can arrive at different Indu Lagnas.
Each of the two lords carries a fixed ray value, a kala. The two are added, divided by twelve, and the remainder is counted forward from the Moon's own sign. So Indu Lagna is a SIGN arrived at by calculation — not a planet, and not something an ephemeris reports. The working is shown on this page precisely because the result cannot be checked against a position table.
Accumulation rather than income: assets, holdings, what stays rather than what arrives. It is read alongside the second and eleventh houses rather than in place of them, and its own house position — where it falls from the Lagna and from the Moon — is part of the reading, which is why both are shown.
It is not a second ascendant. It does not replace the Lagna, does not reassign the houses, and a well-placed Indu Lagna in a chart whose second and eleventh houses are afflicted is not a promise of anything. Like every calculation here it is one factor, and a factor is not a verdict.