Latitudes, Longitudes and Time Zones Explained | UPSC & State PSC

Master the geography of latitudes, longitudes, and Indian Standard Time for competitive exams. Learn how standard meridians, time zones, and global coordinates affect local times across regions. Essential conceptual clarity for UPSC, RPSC, UPPSC, and HPSC aspirants. After this lesson you will be able to: • Explain how Indian Standard Time is calculated using standard meridians • List the arguments for and against multiple time zones in India • Calculate local time differences based on longitudinal degrees • Answer a Prelims question on time zones and global coordinates accurately 🎁 FREE PDF: all 421 UPSC Polity PYQs (1995-2026) + this lesson's detailed notes PDF on Telegram: https://t.me/+uohNVvNlcsJkNGVl Chapters: 00:00 Introduction 00:10 Understanding IST Offset 00:27 Evolution of Indian Time 00:46 The Reference Longitude 01:00 Why This Longitude? 01:18 The East-West Time Gap 01:32 Regional Adaptations 01:51 Key Regions in Indian Time 02:09 UPSC Prelims 2006: Through which one of the following groups 02:43 If it is 10:00 AM IST, what is the local time at Shillong on 03:10 Lesson Summary Reference: https://en.wikipedia.org/wiki/Indian_... Map boundaries: Survey of India (via DataMeet) New concept lessons every day for UPSC Civil Services and State PSC (RPSC, UPPSC, HPSC). Subscribe! Recommended book: A Brief History of Modern India Spectrum - https://www.amazon.in/s?k=A+Brief+His... (As an Amazon Associate I earn from qualifying purchases.) Do you think India should have separate time zones for the Northeast? Let us know in the comments! #UPSC #Geography #TimeZones #Geography