About Lunar Phases Calculator

What this site does

Lunar Phases Calculator is a free set of moon phase tools: a daily moon phase check, a birthday moon phase calculator, a moon phase soulmate comparison, a full moon calendar for 2026, and a general moon phase calendar for any month or year. Every calculation runs in your browser -- no account, no data sent to a server.

How the calculations work

The moon phase engine uses a mean synodic month algorithm (29.53058867 days per lunar cycle) anchored to a documented reference new moon. It's checked against real, independently published full moon timestamps for 2026 and lands within about half a day of the true astronomical moment across the whole year -- accurate enough for a daily check or a birthday lookup, though not observatory-grade precision. The Full Moon Calendar page uses sourced, published dates and times rather than this site's own calculation, since those benefit from more precise astronomical modeling than a simple mean-cycle formula provides.

How the data is kept current

Full moon dates, times, and names are checked against current published astronomical calendars (cited on each page) rather than carried forward year to year. When 2027 data is available, those pages will be built and sourced the same way.

Cedrick Reese

Lunar Phases Calculator was created by Cedrick Reese, a retired veteran and web developer who enjoys building free, user-friendly online tools that simplify everyday tasks. It's one of the tool sites I run under Ready Utilities. My journey began in the early 2000s with affiliate marketing and niche site development, which grew into a passion for creating practical digital utilities and calculators. After retiring, I earned a Computer Systems Technician certificate from UEI College, completed Electro-Mechanical Technologies at Tulsa Welding School, and finished the Carpentry program at Florida State College at Jacksonville. Today, I combine my technical background and craftsmanship by building furniture using traditional woodworking methods, gardening, and developing helpful online tools for users worldwide.