The 'astronomical observations' for finding true bearing are taken using:
Choose the correct answer
Magnetic compass for all cases
Solar observations (sun) or star (Polaris) — provides true bearing independent of magnetic declination
Electronic level only
GPS only (no astronomical observations needed today)
Correct Answer
B. Solar observations (sun) or star (Polaris) — provides true bearing independent of magnetic declination
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
Astronomical observations for true north/bearing: (1) Solar observations (noon observation or hour angle method — sun) — used in field with darkened telescope; (2) Polaris (North Star) observation — most precise for high latitudes; (3) Ex-meridian observations. Required when magnetic declination is unknown or precision is needed. Used to orient traverse, determine true azimuth of boundaries.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.