A calculated astronomical lunar calendar and ephemeris featuring apparent geocentric Moon positions, tropical zodiac signs, exact phase quarters, eclipses, and calendar exports.
AstroMoon calculates instantaneous celestial coordinates client-side using high-precision planetary and lunar algorithms from astronomy-engine@2.1.19 (VSOP87 / ELP2000-82). It provides day-by-day lunar illumination fractions, exact New/Full Moon syzygies, solar and lunar eclipses, and sub-second zodiac sign ingresses adapted to your local observer timezone.
It shows the Moon’s tropical zodiac sign at noon in your selected timezone. An ingress marks the time the Moon enters a new sign. Select a date for its noon position, timed events, and traditional interpretations, which are not scientific predictions.
The tropical zodiac uses twelve equal 30° signs, starting with Aries at the March equinox. Moon positions are calculated from Earth’s center using astronomy-engine and mapped to tropical signs rather than constellation boundaries.
The same event can fall on different calendar days in different timezones. Choose your timezone under Your sky to use your local dates and times, including daylight saving changes. Eclipse entries mark global peaks and do not indicate local visibility.
Open Export, choose your dates and events, then download an ICS file for a one-time calendar import or a PDF for printing. Calendar PDFs include whole months, one per A4 page, up to 24 months. Data-table PDFs use your exact date range. ICS imports do not update automatically.
Choose Northern or Southern under Your sky to flip the Moon illustrations. Event times, zodiac positions, and illumination percentages stay the same. The Moon’s actual tilt also depends on your location and observation time.