Local Mean Time is defined as what?

Local Mean Time is defined as what?

• A. The local time of any particular meridian
• B. The universal time based on the prime meridian
• C. The time zone offset from UTC
• D. The time used at sea level

Answer: (A)

Local Mean Time is the time corresponding to the mean solar time on a specific meridian. In other words, it’s the time shown by a clock that runs at a constant rate equal to the mean solar day for that longitude, so noon occurs when the Sun crosses that meridian. This differs from universal time, which is tied to the prime meridian, and from time zone offsets, which apply a fixed difference from UTC across regions. It has nothing to do with sea level.

Local Mean Time is the time corresponding to the mean solar time on a specific meridian. In other words, it’s the time shown by a clock that runs at a constant rate equal to the mean solar day for that longitude, so noon occurs when the Sun crosses that meridian. This differs from universal time, which is tied to the prime meridian, and from time zone offsets, which apply a fixed difference from UTC across regions. It has nothing to do with sea level.