upoCal – Uposatha Calendar & Dawn-rise

upoCal is a free and open-source app for calculating highly accurate solar times and viewing Uposatha dates.

All calculations are performed directly on your device.

### Accurate Solar Time Calculations

Optional down-to-the-second precision for:

• Solar noon
• Sunrise and sunset
• Civil dawn and dusk
• Nautical dawn and dusk

### Dawn-rise (Aruṇuggamana)

• Multiple calculation formulas available
• Adjustable according to individual preferences and traditions

### Myanmar Uposatha Calendar

• View Myanmar Uposatha dates years into the future or past
• Monthly timetable view
• Yearly calendar view

### Features

• Home Screen widgets in various sizes
• Battery-efficient widget updates

• Adjustable dawn-rise(Aruṇuggamana) calculation methods
• GPS-based dawn-rise, noon time calculations
• Support manual location input

• Satellite and street map location preview (Internet connection required)
• Dark Mode support
• Optional display of times down to the second
• Multilingual support

• No account required
• No advertisements
• Open source

Designed for practitioners, monastics, and anyone who wishes to follow solar times and Uposatha observances with precision.