World Time Zones: History, Politics, and the Prime Meridian

Status: draft · Confidence: low (0.45) · Basis: verified_sources

Quality notes: placeholder_content, generic_source_homepage, no_verified_sources, partial_source_verification

## TL;DR

24 theoretical 15° zones, 38 actual zones due to politics. Originated 1884 International Meridian Conference (Greenwich chosen). China spans 5 geographic zones but uses 1 (UTC+8). Nepal UTC+5:45, Chatham Islands UTC+12:45.

## Core Explanation

Before zones: 144 local times in US by 1870. Sir Sandford Fleming proposed 24-zone system 1876. France used Paris Meridian until 1911. DST: ~70 countries, first Germany 1916. International Date Line deviations: Kiribati UTC+14. Leap seconds: 27 since 1972, proposal to abolish by 2035.

## Detailed Analysis

[待后续补充。]

## Further Reading

- [Source 1 — World Time Zones: History, Politics, and the Prime Meridian](https://www.timeanddate.com/)

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