Zolunas combines browser-native APIs, well-established open algorithms, and a small number of third-party services. We keep the list short so accuracy is easy to reason about.
IANA Time Zone Database
Powers all time zone conversions, offsets, and DST transitions via the browser Intl API. Maintained by IANA and updated with each browser/OS release.
NOAA Solar Calculator algorithm
Used for sunrise, sunset, solar noon, and day-length calculations from latitude, longitude, and date.
Synodic lunar month reference
Used for moon phase and illumination percentage, calculated client-side from a known reference new moon.
wttr.in
Live weather conditions and forecasts. When you search a location, that query is sent to wttr.in to fetch results — no account data is attached.
Curated public holiday list
A maintained dataset of national and regional holidays used on the Calendar and Holidays pages. Always confirm with an official source for legal, payroll, or compliance use.
Pythagorean numerology tables
Traditional letter-to-number mapping and master/karmic-debt number rules used across all numerology calculators.
See Methodology for how each of these sources is used in specific calculations, and Privacy for what data leaves your device.