Lịch Vạn Niên 2025

Below is a detailed description but no more than 4000 words about **Perpetual Calendar Application**, based on the images you have provided.

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### **Introducing the Perpetual Calendar application**
Van Nien Calendar is a utility application that helps users look up information about the lunisolar calendar, good and bad days, horoscopes, feng shui, date changes and traditional Vietnamese cultural elements. The application has an intuitive, easy-to-use interface, helping users track important events, choose good days and learn personal destiny.

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## **1. Interface and main features**
The application has a minimalist design, easy to operate with main items neatly arranged in the navigation bar. Outstanding features include:

### **a. Home**
- Displays the current date according to both solar and lunar calendars.
- Provides information about zodiac hours, good and bad days, daily destiny, and chi.
- Suggest important events of the day.

### **b. Monthly calendar**
- Allows viewing the entire month with lunisolar days.
- Mark good days (yellow stars), bad days (black stars) and important holidays such as Lunar New Year and Full Moon of January.
- Users can move between months easily.

### **c. Changing lunisolar days**
- Convert between solar and lunar dates.
- Displays full information about the horoscope, date, and zodiac time.

### **d. See good and bad days**
- Look up beautiful days for weddings, grand openings, and groundbreakings.
- Provide a list of bad days to avoid.

### **e. Horoscope - feng shui**
- Daily horoscope, lifetime horoscope based on lunar date of birth.
- See the stars that guide your destiny and how to overcome bad luck.
- Provide information about feng shui, five elements, and suitable house directions.

### **f. Prayer text**
- Collection of traditional prayers for holidays, worship, and death anniversaries.
- Instructions on how to perform the ritual according to customs.

### **g. Extensions**
- View weather by day and week.
- Fun fortune-telling: love fortune-telling, career fortune, age suitable for business.

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## **2. Details of important features**

### **a. Changing lunisolar days**
The date change feature helps users quickly switch between solar and lunar calendars. For example:
- The date **March 21, 2025** of the solar calendar corresponds to **February 22, 2025** of the lunar calendar.
- Provides additional information such as **Water element**, **Ky Suu** element, zodiac hour.

### **b. Monthly calendar and good and bad days**
Monthly calendar helps keep an overview of good days and bad days:
- **Good days**: Marked with **gold stars** (eg: 8, 9, 18, 26).
- **Bad days**: Marked with **black stars** (eg: 7, 14, 15, 17).
- Major holidays such as **Lunar New Year, Qingming, Hung Vuong** are clearly displayed.

### **c. See good and bad days according to specific events**
- A good day for **openings, groundbreaking, departures, weddings**.
- On bad days, avoid doing important things.

### **d. Horoscope and feng shui**
- **Daily horoscope**: Based on age, destiny, and stars.
- **Lifetime horoscope**: Predict destiny according to lunar year of birth.
- **Seeing stars' destiny**: Predicting good and bad stars, how to resolve them.
- **Feng Shui**: See the direction of the house that suits your age and lucky colors.

### **e. Prayer - traditional ritual**
The application provides prayers for important occasions such as:
- **New Year's Eve offerings, New Year's Eve offerings, full moon offerings, Ong Tao offerings**.
- **Praying to the ancestors, praying to the god of wealth, praying for peace and liberation**.

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## **3. Outstanding features of the application**
- **Combined lunisolar calendar**: Helps keep track of holidays and offerings.
- **Feng shui information, detailed horoscope**: Helps choose a good day and suitable house direction.
- **Supports cultural traditions**: Provides important prayers and rituals.
- **Intuitive, easy-to-use interface**.

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## **4. Practical application**
- **Work planning**: Choose a good day to sign the contract and open the house.
- **Prepare worship rituals**: Support standard prayers.
- **Entertainment and cultural learning**: Fun fortune telling and horoscopes help you relax and discover yourself.

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The Perpetual Calendar application not only helps users view the calendar but also helps learn and preserve traditional cultural values.