Sure, here's a simple Python program to convert 27 degrees Fahrenheit to degrees Celsius using the given formula:
```python
# Input temperature in Fahrenheit
fahrenheit = 27
# Convert Fahrenheit to Celsius
celsius = (fahrenheit - 32) / 1.8
# Display the result
print(f"{fahrenheit} degrees Fahrenheit is equal to {celsius} degrees Celsius.")
```
When you run this program, it will calculate and display the equivalent temperature in degrees Celsius.