Moon Phase Calendar
Track lunar phases, illumination percentages, and full moon dates for any month and year.
A moon phase calendar charts the changing appearance of the Moon as viewed from Earth through its 29.53-day synodic cycle, tracking illumination from New Moon to Full Moon for astronomy and navigation.
Where λm and λs represent the ecliptic longitudes of the Moon and Sun, and βm represents lunar latitude.
August 2026
Share This Tool
Help your team and fellow developers save time with free, private client-side utilities.
Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools
How to Use Moon Phase Calendar
Select Month and Year
Browse past or future calendar months to visualize the complete lunar progression.
Inspect Lunar Phase Icons
Identify New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, and Waning Crescent.
View Illumination and Solar Cycles
Check exact percentage of lunar illumination and astronomical milestones.
Practical Examples & Conversions
Synodic Period
29 days, 12 hours, 44 minutes, 2.8 seconds (29.530588 days)
Frequently Asked Questions (PAA)
Related Tools & Converters
Authoritative Standards & Citations
Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:
RFC 7519: JSON Web Token (JWT)
Standardized compact, URL-safe means of representing claims to be transferred between two parties.
Web Cryptography API Specification
Standard JavaScript API for performing basic cryptographic operations in web applications.
RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace
Definition of uniform format and generation algorithms for UUIDs.