Heliacal Rising & Setting
Track when planets emerge from or disappear into the Sun's light.
Calculation Parameters
Heliacal Events
Methodology: Heliacal events calculated using Swiss Ephemeris apparent positions, standard atmospheric refraction, and arcus visionis visibility model.
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Emma
Birth Time: Jan 1, 1990 · 12:00
Birth Place: London, UK
House System: Placidus
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Emma
Birth Time: Jan 1, 1990 · 12:00
Birth Place: London, UK
House System: Placidus
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Questions
and Answers
What is heliacal rising?
Heliacal rising occurs when a planet becomes visible again in the pre-dawn sky after being hidden by the Sun's light. It marks the planet's emergence from conjunction with the Sun, symbolizing renewal and new beginnings in that planet's themes.
What is heliacal setting?
Heliacal setting is when a planet makes its last visible appearance in the evening sky before disappearing into the Sun's beams. This marks the beginning of the planet's invisible phase as it approaches conjunction with the Sun.
Which planets have heliacal events?
The five naked-eye planets—Mercury, Venus, Mars, Jupiter, and Saturn—all have heliacal risings and settings. These events were observed by ancient astronomers and remain significant in traditional astrology.
How accurate are these calculations?
We use Swiss Ephemeris, the gold-standard astronomical library, with its rigorous heliacal visibility algorithm. This accounts for atmospheric refraction, arcus visionis (the minimum Sun-planet angular separation for naked-eye visibility), and your exact geographic coordinates to determine when each planet becomes visible.
How does location affect heliacal visibility?
Your geographic latitude significantly affects when heliacal events occur. The angle of the ecliptic to the horizon varies by location and season, meaning a planet may rise heliacally on different dates depending on where you're observing from.
What is the morning star?
The 'morning star' traditionally refers to Venus when it appears in the pre-dawn eastern sky after its heliacal rising. Mercury, Mars, Jupiter, and Saturn can also appear as morning stars during their visible phases before sunrise.
What is the evening star?
The 'evening star' refers to a planet visible in the western sky after sunset. Venus as the evening star is especially prominent, but any of the five visible planets can serve as evening stars before their heliacal setting.
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