Answer

Yes, you may eat after sunrise even if you did not take Navkarsi Pachkhan, but spiritually it is not considered the same as doing Navkarsi properly.

Explanation

In Jain practice, Navkarsi generally means avoiding food and water until about 48 minutes after sunrise, with proper intention and restraint.

The Pachkhan is important because it is a formal vow or resolve. Without taking Pachkhan, one may have physically not eaten, but the spiritual discipline of the vow is incomplete.

So:

• If you did not take Navkarsi Pachkhan, you can still eat after the Navkarsi time is over.
• But you should not count it as a properly observed Navkarsi vow.
• Before eating, it is good to remember Arihant Bhagwan, do a small prayer, and eat with humility.

Spiritual Understanding

In Jain Dharma, intention and awareness are very important. Pachkhan makes the restraint conscious and spiritually meaningful. It turns ordinary not-eating into a disciplined religious practice.

Takeaway

You can break the fast after Navkarsi time without Pachkhan, but for proper Navkarsi in the Jain religious sense, Pachkhan should be taken before observing it.