Here is a simple, core explanation of avasarpini and utsarpini in Jain cosmology:

• Avasarpini

- It is the downward or descending half of the cosmic time cycle. - In this era, the moral and spiritual qualities of the world gradually decline. - Lifespans shorten over time, violence and suffering tend to increase, and spiritual progress becomes harder. - The order of spiritual teachers and Tirthankaras continues, but the overall spiritual atmosphere grows tougher.

• Utsarpini

- It is the upward or ascending half of the cycle that follows avasarpini. - In this era, there is a gradual uplift in virtue and spiritual potential. Lifespans lengthen, peace increases, and souls have greater opportunities for spiritual progress. - The world moves toward greater Dharma and spiritual well-being.

Key point

• Jain cosmology describes time as a repeating, cyclic pattern of these two halves: avasarpini (decline) followed by utsarpini (rise), then the cycle repeats. Each half has its own phases and many Tirthankaras are said to appear in different eras, guiding beings toward liberation.

Notes

• Both Digambar and Shwetambar traditions accept the avasarpini–utsarpini framework, though there may be differences in how specific time periods, names, or sequences of Tirthankaras are described in various texts. The essential idea, however, remains the same: time moves in cycles of decline and rise, affecting moral and spiritual prospects of beings.

If you’d like, I can provide short, precise quotations from Jain scriptures and explain their artha (meaning) in more detail.