Civil Engineering - UPSC Civil Service Exam Questions - Discussion

20. 

The local sidereal time (LST) is always

[A]. ahead of the local mean time (LMT) by about 2 hours per month
[B]. behind LMT by about 2 hours per month
[C]. ahead of LMT by about 4 hours per month
[D]. equal to LMT

Answer: Option A

Explanation:

No answer description available for this question.

Hitesh said: (Jan 5, 2017)  
In Gupta book, the answer is b.

Flora said: (Mar 3, 2018)  
Yeah, it's b, I also agree @Hitesh.

Mahesh Sinh said: (May 24, 2020)  
It's ahead 4 minutes per day than in one month.
30*4= 120 minute convert it in hr.
2 hrs per month.

Loesher said: (Aug 18, 2020)  
1 local mean day 24 hours=>23hours 56' min 4.09" sec of the sidereal day.

The sidereal time is always behind the LMT.

Anonymous said: (May 5, 2021)  
Answer should be B.

Muhammad Mumtaz said: (Jul 8, 2021)  
Anyone explain about sidereal time.

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