The Sage said — Your question is a good one and is for the benefit of the world at large. Considering your attachment, I will tell you about this problem also. If any or all amongst the samvatsar, ayana, ritu, month, paksha, tithi, nakshatra, Ascendant, rasi or amsas etc., of the birth are not known, these can be ascertained from Prasna Lagna (Query chart).

वर्षायनर्तुमासार्धतिथिनक्षत्रभादिषु । यदज्ञातं च तज्ज्ञानं ज्ञायते प्रश्नलग्नतः । ।4।। जिस व्यक्ति का जन्म वर्ष, अयन, ऋतु, मास, पक्ष, तिथि, नक्षत्र, राशि आदि कुछ भी ज्ञात न हो तो उसका निर्णय प्रश्नलग्न से करना चाहिए ।