Heliacal Rising & Setting – Planets
Track when planets emerge from or disappear into the Sun's light.
Note: This models a clear dark sky with good eyesight.
Heliacal Events
Methodology: Heliacal events calculated using Swiss Ephemeris apparent positions, Garstang atmospheric extinction, and Schaefer (1993) photometric visibility. Accounts for atmospheric conditions, observer acuity, and your exact location.
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Heliacal Rising and Setting: The Planetary Cycle of Visibility
Every planet cycles through visibility relative to the Sun. Heliacal rising marks first appearance, heliacal setting marks last — the most significant phases.
The Naked Eye: Astrology as Embodied Perception
The entire astrological tradition is built on what a human being standing on Earth can see when they look up. Every concept in the system traces back to that perceptual foundation.
Morning Star and Evening Star: Solar Orientation in the Birth Chart
A planet's relationship to the Sun shapes how it expresses itself — whether it acts before the Sun (initiating) or after it (reflective).
Accurate.Simple.Capable.
Made for All Levels
The chart wheel reads cleanly without astrological background. Aspect grids and planetary conditions are one click deeper for those who want them.
Simple Surface, Deep Core
Every chart type — natal, transit, synastry, returns, progressions — from a single profile.
Swiss Ephemeris
Swiss Ephemeris under professional license. Accurate to the minute of arc.
House Systems & Orbs
Switch between Placidus, Whole Sign, Koch, Equal House, and several others. Tighten or loosen aspect orbs. Add asteroids. Defaults work; the controls are there if you want them.
Accurate.
Simple.
Capable.
Made for All Levels
The chart wheel reads cleanly without astrological background. Aspect grids and planetary conditions are one click deeper for those who want them.
House Systems & Orbs
Switch between Placidus, Whole Sign, Koch, Equal House, and several others. Tighten or loosen aspect orbs. Add asteroids. Defaults work; the controls are there if you want them.
Simple Surface, Deep Core
Every chart type — natal, transit, synastry, returns, progressions — from a single profile.
Swiss Ephemeris
Swiss Ephemeris under professional license. Accurate to the minute of arc.
A Couple
of Things
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. Traditional astrology read it as the planet's emergence from invisibility — a moment of fresh activation in the planet's significations.
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?
Swiss Ephemeris's heliacal visibility algorithm accounts for atmospheric extinction, observer acuity, and your exact geographic coordinates to determine when each planet first becomes visible to the naked eye.
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.