Previous Year Question
If the Sun rises at TIRAP in Arunachal Pradesh at 5.00 am (IST), then what time (IST) the Sun will rise in Kandla in Gujarat?
About 5.30 a.m.
About 6.00 a.m.
About 7.00 a.m.
About 7.30 a.m.
Correct Answer: C
Detailed Solution
Tirap in Arunachal Pradesh, situated in the eastern part of India, lies considerably east of Kandla in Gujarat, situated in western India. Since the Earth rotates from west to east, places in the east experience sunrise earlier.
Tirap district lies approximately between 95°–97° E longitude, whereas Kandla is located near 70° E longitude. Thus, the longitudinal difference between them is approximately 25°–27°.
A difference of 1° longitude corresponds to about 4 minutes of time. Therefore, a difference of 25°–27° corresponds to approximately 100–108 minutes, or about 1 hour 40 minutes to 1 hour 48 minutes.
Hence, if sunrise occurs at Tirap at 5.00 a.m., sunrise at Kandla would occur at roughly 6.40–6.50 a.m., making about 7.00 a.m. the closest option.