Dictionary term
Blue Hour
Direct answer
Blue Hour is an informal photographic period of cool, diffuse twilight light before sunrise or after sunset.
Blue Hour is the cool-toned twilight interval favored by photographers.
- 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 Blue Hour as a planning label alongside actual Sun-altitude times rather than as a fixed sixty-minute period.
- Do not use it for
- Definitions vary by app, often using different negative solar-altitude ranges; state the method when precision matters.
- Reference category
- Seasons & Earth Almanac
- Related terms
- Nautical Twilight, Golden Hour, Astronomical Season, Equinox
The story behind Blue Hour
Photography and cinematography popularized the term for a twilight quality artists had long observed.
Blue Hour in spiritual tradition
Spiritually, Blue Hour can encourage attentive seeing without turning a color effect into a universal omen.
The Great Almanac frames Blue Hour 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.
Blue Hour 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.
Blue Hour in numerology
Blue Hour 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 Blue Hour matters
Its balanced sky and artificial-light levels can produce saturated blue scenes, but duration changes with latitude and season.
Example in a reading: A high-latitude summer Blue Hour can last far longer than the brief tropical transition.
Interpretive caution: Definitions vary by app, often using different negative solar-altitude ranges; state the method when precision matters.
How Blue Hour is used in a reading
Use Blue Hour as a planning label alongside actual Sun-altitude times rather than as a fixed sixty-minute period.
Where interpretation stops
Blue Hour 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:
- NOAA Global Monitoring Laboratory: Solar Calculator Glossary - NOAA definitions for solar geometry, atmospheric refraction, and civil, nautical, and astronomical twilight.
- National Weather Service: Atmospheric Optics - NWS science reference for halos, pillars, sundogs, green flashes, rays, and related optical displays.
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 Blue Hour inside a wider reference cluster instead of leaving it as a standalone keyword.
