Moon Phase Calculator
About Moon Phase Calculator
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 : Use Moon Phase Calculator from the Time category.
- Check the inputs : Review the required values and any optional settings.
- Read the formula : Use the formula and notes below to understand how the result is produced.
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.
Inputs
- Date
Outputs
- Phase name
- Illumination
- Phase