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Time

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概要

The Time mind map template provides a comprehensive overview of global timekeeping systems, covering TAI, UTC, GPS, Paper Clocks, UTC (USNO), and Leap seconds across 114 nodes. It explains how TAI is computed by the International Bureau of Weights and Measures (BIPM) from a weighted average of 60 laboratories, while UTC is adjusted with leap seconds to align with Earth's rotation. The GPS time scale, based on atomic clocks on satellites, has no leap seconds and originates from 6JAN1980. This template serves as a cheat sheet for understanding time standards, including the role of Paper Clocks and the US Naval Observatory's UTC (USNO). Key nodes like 'TAI -19 seconds' and 'Leap second added to UTC' clarify offsets and adjustments. Ideal for engineers, scientists, and students, this Xmind template organizes complex temporal concepts into an accessible mind map.

利用規約

このテンプレートを使うタイミング

Aerospace engineers and GNSS system architects

Designing a satellite navigation system that requires precise time synchronization across atomic clocks.

Physics or astronomy educators and students

Preparing a lecture or study material on the history and mechanics of global time standards.

Software developers and systems engineers working on time-critical applications

Debugging time-related discrepancies in software systems that rely on UTC or GPS time.

このテンプレートの使い方

ステップ 1

Open and Explore Time Standards

Open the template in Xmind to navigate the 114 nodes covering TAI, UTC, and GPS timekeeping systems.

ステップ 2

Customize Nodes with Personal Data

Edit the existing branches to add your own technical notes, current offset values, or specific laboratory data.

ステップ 3

Style and Export Your Map

Apply visual themes to distinguish time scales and export your final map as a PDF or image for sharing.

よくある質問

TAI (International Atomic Time) is a continuous time scale based on atomic clocks with no leap seconds. UTC (Coordinated Universal Time) is adjusted with leap seconds to stay within 0.9 seconds of astronomical time, making it the basis for civil time.

GPS time is a continuous atomic time scale with no leap seconds, originating on 6JAN1980. It is currently 19 seconds behind TAI and ahead of UTC(USNO) by a variable offset due to leap seconds.

Paper Clocks refer to the fact that official UTC cannot be known in real-time; it is calculated retrospectively after data from international laboratories is compiled. Institutions like NIST maintain their own real-time approximations.

Leap seconds are added to UTC to keep it within 0.9 seconds of Universal Time (UT1), which is based on Earth's rotation. This compensates for the gradual slowing of Earth's rotation relative to atomic time.

UTC (USNO) is the time reference maintained by the US Naval Observatory for the US Department of Defense. It contributes to both UTC and TAI and is used for military and navigation applications.

GPS time rolls over every 1024 weeks (about 19.7 years) due to its 10-bit week counter. The first rollover occurred on 21AUG1999, and the next will happen in 2019.

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