Navkarsi (Navkarshi) is a Jain vrat observed by some communities. Here’s a brief, simple outline:

• What it is: A one-day vrata focused on simplicity and purification, often including recitation of Namokar Mantra and observance of mild/piya restrictions (such as lighter meals or avoiding certain foods). Practices can vary between Digambar and Shwetambar Jains.
• Common features: Reading or chanting prayers, fasting or partial fasting, and avoiding grains or certain foods depending on local custom.
• Variation: The exact rules, who observes it, and which foods are avoided can differ by temple, region, or tradition. Digambar and Shwetambar communities may describe the vrata with slightly different details or emphasis.

About tomorrow in Mumbai:

• Since you mentioned “todat” (tomorrow) and Mumbai, the exact date and whether Navkarsi is observed locally depend on the temple calendar and the Jain sangh you follow. Tomorrow from today (December 8, 2025) is December 9, 2025, so if you’re planning or attending, best to check the local Mumbai Jain temple schedule or ask the local sangh for the precise observance and timings.

If you’d like, I can look up a specific JainKnowledge page about Navkarsi for precise details per tradition and provide a link.