In Jain scriptures there is no system of an exact astronomical epoch or ephemeris (like a precise date for the position of planets) that corresponds to modern celestial astronomy. Jain literature focuses on:

• Vast cosmic time cycles: the alternating descending and ascending eras (Avasarpini and Utsarpini) and the broader Kalpas (eons) in which the universe undergoes cycles.
• Cosmology with multiple realms and celestial beings, but not a precise, date-stamped mapping of planet positions.
• Spiritual chronology (lifespans of Tirthankaras, eras, and moral/spiritual progress) rather than technical astronomical tables.

If you’re looking for Jain explanations of time, cosmology, or the general structure of the universe (without modern ephemerides), I can point you to authentic Jain sources on these topics.