Ephemera
Calculate solar-system positions and local rise/set times for a date, time and location. Includes city search and a downloadable report.
A new project by Alexander Ferrari Miller
Nativitas
Your sky. Your moment. Your story.
What did the heavens look like when you were born? Nativitas is being developed to reconstruct the celestial positions at a particular place and moment in time, using astronomy as its foundation and exploring astrology as a historical and cultural tradition.
Natal
Explore your birth sky with a natal chart for your birth date, time and place, including planet positions, Placidus houses and major aspects.
Synastry
Compare two birth charts in a bi-wheel, with cross-chart aspects and house overlays.
Planet Finder
Explore the arbitrary-date Planet Finder interface and its long-running calculation progress design. Chart generation is being connected; existing weekly charts remain available.
William Lilly
Christian Astrology (1647)
Lilly's three-book work introduces astrological principles, the interpretation of questions, and natal charts. It provides historical context for the traditional planets, signs and houses explored in Nativitas.
C. E. O. Carter
The Astrological Aspects (1930)
A reference for traditional interpretations of planetary aspects—the angular relationships between planets in a chart.
H. L. Cornell
Encyclopaedia of Medical Astrology (1933)
A historical reference for astrological symbolism. Nativitas names Cornell for zodiac sign keywords.
About Nativitas
Discover the astronomy, historical traditions and accessible experience behind Nativitas.
Add Nativitas to your Home Screen
On iPhone or iPad, open this page in Safari, tap Share, then Add to Home Screen. Leave Open as Web App enabled if shown, then tap Add.
On Android, open your browser menu and choose Install app or Add to Home screen. Wording varies by browser.
Nativitas opens from its own icon. An internet connection is required for chart tools and reference material.
Ephemera is available now. Birth charts and other features remain under development. Astrology's claims about personality and future events have not been scientifically validated.