HOW TO KNOW THE RISING SIGN / ASCENDANT WITHOUT THEIR TIME OF BIRTH

In one simple answer is No it is not possible to know the zodiac sign when birth details are not available at all.

In vedic astrology there is method but its a tedious exercise to know it, and it is a lengthy process. The native need to write down all the events of life date wise and give it to an expert astrologer.

Now the expert astrologer will make a horoscope for that particular event with a random time but with the correct place and that date of the event and rotate the horoscope lagna wise to see as per which lagna that event is happening.

Like wise the astrologer need to make many horoscopes of the events as per that date of the event and see which what is the maximum ascendant that is depicting maximum events need to be considered as the lagna / ascendant of that native.

That lagna / ascendant of the zodiac sign / rashi is the ascendant of that person.

One more method that one can use to know the ascendant sign is by LSRD method of KP vedic astrology.

One need to make calculation for 12 rashi and find their LSRD by asking the native to give 12 numbers between 1 and 249.

Based on the numbers each horoscope will be made taking current date and the current place location for calculation on that day.

Now one need to see how the LSRD planets are getting matched with the zodiac sign / rashi as per the planet lord of that zodiac sign / rashi. ( one need to learn KP astrology to know how to match )

From this one can arrive at the nearest rashi / zodiac sign eliminating the other not supported by LSRD lords.

This LSRD method is a divine method and needed to be done with full devotion by the astrologer and then only one will get the answer.

After arriving at the ascendant from this method then one should test it with the past events of his life thru it.