In Jain Dharma, there isn’t a canonical, fixed astronomical epoch like J2000 for the exact positions of celestial objects or nakshatras. Jain cosmology and timekeeping emphasize cyclic cosmic time and moral/spiritual eras rather than precise modern-astronomy coordinates.

Key points to know:

• Nakshatras in Jain texts are part of a broader Hindu-Jyotisha framework that Jain authors sometimes reference, but the primary Jain focus is on spiritual law, cosmic cycles, and moral conduct, not on providing precise ephemeris data.
• There is no universally adopted Jain “epoch” for star positions. Different Jain traditions (Digambar and Shwetambar) may describe cosmology and calendrical schemes in ways that align with their own suttic or sthanakvasi texts, but none establishes a modern astronomical epoch as a standard reference.
• For exact celestial coordinates or nakshatra positions today, you would rely on standard astronomical ephemerides (e.g., JPL/IAU data) or a traditional Panchangam if you want the nakshatra at a given time, but those are not Jain doctrinal references.

If your aim is to align Jain festive or daily timings with nakshatras in a traditional sense, you typically use a Panchang (lunar calendar) from a reliable source that lists the current nakshatra for the day or for sunrise, rather than a Jain scripture-based epoch.

Note: If you want, I can explain how Jain calendars and lunar-based time concepts map onto broader Hindu/Jyotisha calendars, and where Digambar and Shwetambar traditions differ in their calendrical details.