Section 4: Soil and Water Conservation Engineering
Hydrology
Subtopic: Hydrological cycle and measurement of its components
Question Statement:
The Local Apparent Time (LAT) corresponding to 14 h 30' IST at a place in India (19°07'N, 72°51'E) in April with time correction of zero min will be
Options:
(A) 13 h 51' 24''
(B) 14 h 9' 39''
(C) 14 h 30'
(D) 15 h 8' 36''
Official Answer Key:
A
Step-by-Step Solution & Explanation
IST is referenced to 82°30'E. The place is west of this reference by (82.5 − 72.85) = 9.65°. Time correction for longitude = 4 min per degree × 9.65° = 38.6 min = 38' 36''. Since the place is west of the standard meridian, local time lags IST: LAT = 14 h 30' 00'' − 38' 36'' = 13 h 51' 24'' (the equation-of-time correction is given as zero).
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