Circumpolar Bodies & Twilights| Continuous Day & Night | Mate Exam MMD | Capt. Vishnu Sharma

Описание: Circumpolar Bodies, Continuous Day & Night — Celestial Navigation Explained | Mate (MMD)

This lesson by Capt. Vishnu Sharma explains some of the most important conceptual topics in Celestial Navigation — especially for Mate (MMD) exams.
You’ll clearly understand when stars never set, when the Sun never rises, and how these relate to latitude & declination.

📘 What You’ll Learn
• What circumpolar bodies are
• Why some stars never set below the horizon
• Conditions for a body to become circumpolar
• Continuous Day (24-hour daylight)
• Continuous Night (24-hour darkness)
• Difference between circumpolar bodies & continuous night
• Upper and lower meridian passages of circumpolar stars
• Using rational horizon diagrams to solve problems
• Solving numerical questions step-by-step

⏱️ Key Sections
0:20 Circumpolar bodies explained
11:05 Same-name latitude & declination rule
15:04 Condition: Lat + Dec ≥ 90°
18:16 Continuous Day concept
21:03 Continuous Night explained
22:20 Opposite-name condition
30:00 Meridian passages
31:58 Lower merpass
32:26 Upper merpass
34:38 Numerical examples
54:51 Prime-vertical problem

🎯 Who This Helps
✔ Mate (MMD) candidates
✔ Chief Mate & Second Mate revising concepts
✔ Cadets learning celestial theory
✔ Anyone confused about circumpolar & polar-region phenomena
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🔍 TAGS
Circumpolar bodies explained
Continuous day and night navigation
24 hour daylight celestial
24 hour night celestial
Latitude and declination rules
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Rational horizon diagram examples
Upper and lower meridian passage
Prime vertical altitude problem
Celestial navigation concepts
Mate MMD celestial theory
Polar region navigation theory
Sun never sets explanation
Sun never rises navigation
Declination circle plotting
Celestial meridian passage
Numerical problems circumpolar
Navigation celestial problem solving
Understanding polar navigation
Merchant navy celestial concepts
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