Dictionary term
Pelorus
Direct answer
Pelorus is a sighting compass-card device used to measure directions relative to a vessel's heading.
Pelorus is a relative-bearing instrument used in historical astronomy, timekeeping, or navigation.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Also appears in
- Historical Almanacs & Instruments
- Aliases
- None listed
- Last updated
- 2026-07-16
Quick reference
- Use when
- Use Pelorus by aligning the reference with the ship's fore-and-aft line and sighting the target across the graduated card.
- Do not use it for
- A misaligned lubber line or changing heading makes the bearing unreliable.
- Reference category
- Historical Almanacs & Instruments
- Related terms
- Compass Rose, Magnetic Compass, Celestial Navigation, Dead Reckoning
The story behind Pelorus
Pelorus instruments became standard bridge aids for bearing observations and compass checks.
Pelorus in spiritual tradition
Pelorus rewards careful observation, explicit assumptions, and humility about the limits of every model or measurement.
The Great Almanac frames Pelorus 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.
Pelorus in the Bible
This is a factual history-of-science, instrument, timekeeping, or navigation reference. It may support wonder and disciplined attention without becoming a claim of fate, worship, or private revelation.
Pelorus in numerology
Pelorus 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 Pelorus matters
Pelorus matters because relative bearings help identify landmarks, check compass error, and track other vessels without relying on a magnetic needle.
Example in a reading: A navigator can take the relative bearing of the Sun and combine it with heading to compare observed and computed azimuth.
Interpretive caution: A misaligned lubber line or changing heading makes the bearing unreliable.
How Pelorus is used in a reading
Use Pelorus by aligning the reference with the ship's fore-and-aft line and sighting the target across the graduated card.
Where interpretation stops
Pelorus 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:
- National Geospatial-Intelligence Agency: The American Practical Navigator - Official modern reference for navigation principles, celestial observations, sight reduction, and navigational tables.
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.
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These related entries help place Pelorus inside a wider reference cluster instead of leaving it as a standalone keyword.
