Dictionary term
Astronomical Dawn
Direct answer
Astronomical Dawn is the morning instant when the Sun center rises through 18 degrees below the horizon.
Astronomical Dawn begins astronomical twilight at a -18-degree solar altitude.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Also appears in
- Seasons & Earth Almanac
- Aliases
- None listed
- Last updated
- 2026-07-16
Quick reference
- Use when
- Use Astronomical Dawn to close an overnight observing window and plan long-exposure astronomy.
- Do not use it for
- Light pollution, airglow, Moon, and high-latitude summer can make practical darkness differ from the calculated boundary.
- Reference category
- Seasons & Earth Almanac
- Related terms
- Nautical Dusk, Astronomical Dusk, Astronomical Season, Equinox
The story behind Astronomical Dawn
The eighteen-degree standard provided observatories a repeatable boundary for residual solar illumination.
Astronomical Dawn in spiritual tradition
Spiritually, Astronomical Dawn can mark the quiet first return of solar influence without turning darkness into fear.
The Great Almanac frames Astronomical Dawn with educational restraint. Mystical or symbolic language may be meaningful, but it should not be exaggerated into certainty, panic, or permission to ignore ordinary responsibility.
Astronomical Dawn in the Bible
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Astronomical Dawn in numerology
Astronomical Dawn is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Astronomical Dawn matters
It marks the conventional end of full natural night for sensitive sky observation.
Example in a reading: Faint-object imaging often ends near Astronomical Dawn, before any visible sunrise glow for casual observers.
Interpretive caution: Light pollution, airglow, Moon, and high-latitude summer can make practical darkness differ from the calculated boundary.
How Astronomical Dawn is used in a reading
Use Astronomical Dawn to close an overnight observing window and plan long-exposure astronomy.
Where interpretation stops
Astronomical Dawn is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Rise, Set, and Twilight Definitions - Official definitions used for sunrise, sunset, refraction, and twilight calculations.
- NOAA Global Monitoring Laboratory: Solar Calculator Glossary - NOAA definitions for solar geometry, atmospheric refraction, and civil, nautical, and astronomical twilight.
The page starts with a direct definition, then separates use, example, caution, spiritual meaning, and historical context. For astrology, occult, demonology, curse, and spiritual warfare terms, the editorial rule is to explain the term without making fear-based, fatalistic, medical, legal, financial, or ritual-instruction claims.
Continue learning
Continue into the live sky, space weather, universal timing, and the wider field surrounding the current season.
Open Worldwide WatchRelated terms
These related entries help place Astronomical Dawn inside a wider reference cluster instead of leaving it as a standalone keyword.
