Kalachakra (Kaal‑chakra) in Jainism means the eternal “wheel of Time.” Time has no beginning or end and moves in endless cycles. Each complete time‑cycle has two halves:

• Utsarpini (ascending/progressive): happiness, strength, age, knowledge, and dharma gradually improve.
• Avasarpini (descending/regressive): the same gradually decline.

Each half is divided into six eras (ārā). From best to worst they are: Suṣama‑suṣamā, Suṣamā, Suṣama‑duṣamā, Duṣama‑suṣamā, Duṣamā, and Duṣama‑duṣamā. The first four are extremely long; the last two are comparatively short (in traditional accounts, measured in thousands of years). According to Jain tradition, we are now in the 5th era (Duṣamā) of the Avasarpini in Bhārat Kṣetra; after it will come the 6th era, even more difficult for spiritual life.

Spiritual significance

• In every half‑cycle, exactly 24 Tirthankars appear to re‑establish the path of liberation; in our current Avasarpini, the 24th was Bhagwan Mahavira.
• The moral and physical state of beings, lifespan, and spiritual receptivity all change with the eras, which is why scriptures describe different capacities and practices in different times.
• The wheel never stops: after Avasarpini ends, a new Utsarpini begins, and the pattern repeats forever.

Digambar and Shvetambar

• Both traditions accept this same cyclical model (two halves, six eras, and 24 Tirthankars per half‑cycle). Some texts differ slightly on certain numerical details, but not on the overall meaning.

For a simple overview of the Jain time‑cycle: On which era we are in now: On why there are 24 Tirthankars in every half‑cycle: