Note4Students
From UPSC perspective, the following things are important :
Prelims level: Coordinated Lunar Time, Coordinated Universal Time (UTC)
Mains level: NA
Why in the news?
- The White House directed NASA to establish a time standard for the Moon, named Coordinated Lunar Time (LTC) by the end of 2026.
- This move aims to facilitate coordination among international bodies and private companies operating on the lunar surface.
Timekeeping on the Moon
- The Moon has its own day and night cycle, which lasts about 29.5 Earth days.
- Currently, the time on the Moon is measured using Coordinated Universal Time (UTC), which is the same timekeeping system used on the Earth.
- However, because the Moon’s day is much longer than Earth’s day, it would be difficult to use UTC for day-to-day activities on the Moon.
Coordinated Universal Time (UTC)
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Need for a Lunar Time Standard
- Earth’s Time Standard:
- Earth’s time standard is primarily based on Coordinated Universal Time (UTC), set by the International Bureau of Weights and Measures in Paris, France.
- UTC is determined by a weighted average of over 400 atomic clocks worldwide, providing a universally agreed-upon standard for time measurement.
- Challenges with Earth’s Time Standard on the Moon:
- Time on the Moon differs from Earth due to factors like gravity and the Moon’s rotation.
- Time on the Moon ticks slightly faster due to lower gravity (about 56 microseconds every day) as per Einstein’s Theory of General Relativity.
Establishing a Lunar Time Standard:
- Technical Considerations:
- LTC cannot be based on UTC due to the time differences between Earth and the Moon.
- Current lunar missions operate on independent timescales linked to UTC, but this approach becomes challenging with multiple space crafts on the Moon.
- Deployment of Atomic Clocks:
- Like on Earth, atomic clocks can be deployed on the lunar surface to establish a time standard.
- A 2023 report suggests placing at least three atomic clocks on the Moon’s surface, accounting for variations in lunar rotation and local gravity.
- Synthesizing Time Measurements:
- Atomic clocks placed at different lunar locations will tick at the Moon’s natural pace.
- Output from these clocks will be combined using algorithms to generate a unified time standard for the Moon, tied back to UTC for Earth operations.
Earth’s Latitudinal Variations on Time
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Benefits offered by Lunar Time
- Having a lunar time zone would also make it easier for scientists and researchers to conduct experiments and collect data on the Moon.
- It would also help to prevent confusion and errors that could arise from using different timekeeping systems on Earth and the Moon.
PYQ:[2015] Tides occur in the oceans and seas due to which among the following? 1. The gravitational force of the Sun 2. The gravitational force of the Moon 3. The centrifugal force of the Earth Select the correct option using the code given below: (a) 1 Only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3 |
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