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

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 🌐 Connect with Sailor Rider YouTube: 👉    / @sailor_rider   Facebook: 👉   / 19imzynlrp   Instagram: 👉 https://instagram.com/sailor_rider?ig... Threads: 👉 https://www.threads.com/@sailor_rider 🔍 TAGS Circumpolar bodies explained Continuous day and night navigation 24 hour daylight celestial 24 hour night celestial Latitude and declination rules Circumpolar condition latitude declination 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 #️⃣ #CelestialNavigation #MatesExam #MerchantNavy #NauticalScience #NavigationTutorial