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Celestial Navigation — Ex-Meridian, Intercept vs Long by Chronometer & Polaris | Mate’s Exam This lesson explains some of the most important celestial navigation concepts asked in Mate’s Examinations — combining theory, formulas, and practical examples. The instructor shows not just how to calculate, but when and why each method should be used. 📘 What You’ll Learn • Difference between Intercept Method and Longitude by Chronometer • Why both methods produce the same position line • Ex-Meridian observations and their purpose • Calculating Meridional Zenith Distance (MZD) • When Ex-Meridian tables can and cannot be used • Traditional (pre-GPS) navigation routines • Polaris (Pole Star) method for a quick position line ⏱️ Key Sections 0:06 Intercept vs Long by Chronometer 6:26 Ex-Meridian concept 10:00 Calculating MZD 18:00 Observed latitude logic 26:40 Ex-Meridian table limits 32:00 What to do if observation lies outside limit 41:40 How officers navigated before GPS 49:00 DR & coastal navigation insight 59:33 Polaris observation basics 🎯 Who This Helps ✔ Mate’s exam candidates ✔ Chief Mate & Second Mate students ✔ Cadets learning celestial navigation ✔ Anyone confused about Ex-Meridian calculations This session builds clarity, logic, and exam confidence. 🌐 Connect with Sailor Rider YouTube: 👉 / @sailor_rider Facebook: 👉 / 19imzynlrp Instagram: 👉 https://instagram.com/sailor_rider?ig... Threads: 👉 https://www.threads.com/@sailor_rider 🔍 TAGS Ex meridian altitude Intercept vs long by chronometer Celestial navigation exam methods Meridional zenith distance calculation Observed latitude from ex meridian Ex meridian tables explained Limit of ex meridian method Position line from celestial body Traditional celestial navigation Polaris observation method Pole star navigation basics Dead reckoning and celestial Pre GPS navigation routine Chief mate celestial navigation Mates exam celestial problems Longitude by chronometer explained Intercept method explained Navigation exam celestial topics Nautical almanac practical use Celestial plotting for exam #️⃣ #CelestialNavigation #MatesExam #MerchantNavy #NauticalScience #NavigationTutorial