Moon Phase Calculator
Find moon phase and illumination for a date.
Phase name
New moon
Illumination
0.2%
Phase
0.986
Find moon phase and illumination for a date.
How to Use
Find moon phase and illumination for a date. Enter the Date values and review the Phase name, Illumination, and Phase outputs after you calculate.
- Open the calculator : Start with Moon Phase Calculator.
- Enter values : Fill in the required inputs and any optional settings.
- Review the result : Read the output and use the about page for more detail if needed.
Common Questions
What does the Moon Phase Calculator estimate?
It estimates the moon phase and illumination for a chosen date.
What can change the result?
The date and the underlying astronomical algorithm control the phase estimate.