Your lagna is the sign that was rising on the eastern horizon at the moment and place of your birth. It is the point every house in the chart is counted from, which makes it the most time-sensitive figure in a kundli - and the one most often recorded wrongly. This calculator gives the rising sign, its exact degree, its ruling planet and the rising nakshatra.
The ascendant, or lagna, is the point of the ecliptic rising over the eastern horizon at a given instant and place. Because the earth turns once a day, that point travels the entire zodiac in roughly twenty-four hours - about one sign every two hours on average, though the true rate varies with your latitude and with which sign is rising.
Everything reckoned house-to-house in a chart hangs off it: the twelve bhavas, which planet rules the first house, which planets become functional benefics or malefics for you, the arudha padas, and every yoga defined by a house relationship. Move the lagna by one sign and all of those move with it - which is why a chart cast from a wrong birth time can look perfectly coherent and still describe nobody.
The ascendant advances on average about a quarter of a degree every minute. A birth time remembered only to the nearest hour can put the lagna in the wrong sign outright; a time noted to the nearest five minutes still leaves the degree - and therefore the divisional charts, which are far more sensitive - unsettled.
If your recorded time is uncertain, the honest step is to test it rather than to trust this page's single answer. The rectification tool checks a recorded time against attested classical filters and reports each verdict beside its own source and its own resolution - deliberately without combining them into a score, because no text prescribes one.
This calculator, and the rashi chart throughout the app, use Whole Sign houses: the whole of the rising sign is the 1st house, the next sign is the 2nd, and so on. The lagna's degree settles which sign rises; it does not set a cusp partway through a house.
There is deliberately no house-system picker. The system here is fixed by technique rather than taste - every yoga, dasha, arudha and aspect rule in this engine is reckoned house-to-house on Whole Sign, so switching the rashi chart to a quadrant system would silently invalidate all of them while still rendering. Where another system is genuinely required by a method, it is used there and only there: Sripati for Bhava Chalit, Placidus for KP cusps.
It is the sign rising on the eastern horizon at your exact moment and place of birth. Enter those details above and the calculator returns the rising sign, the lagna's degree within it, the sign's ruling planet and the rising nakshatra.
Not reliably. The ascendant changes sign roughly every two hours, so a birth date alone leaves twelve possible answers. If your time is approximate, treat the result as provisional and test it on the rectification page.
Yes - rising sign, ascendant, lagna and udaya lagna all name the same thing: the sign coming up over the eastern horizon at birth. In Vedic astrology it is measured in the sidereal zodiac, so it can differ from a Western rising sign by roughly one sign.
Whole Sign. The whole of the rising sign is the 1st house and each following sign is the next house. There is no picker, because every house-based rule in this engine is defined on Whole Sign; Bhava Chalit uses Sripati and KP cusps use Placidus, each where its own method requires it.
Almost always for one of three reasons: a different ayanamsha (this tool uses Lahiri), a tropical rather than sidereal zodiac, or a different time zone or daylight-saving assumption for your birth place. A minute or two of difference in the recorded time can also move the degree noticeably.
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For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.