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Time standard

GPS Time

The continuous timescale of the Global Positioning System, offset from TAI by a fixed number of seconds and widely used to synchronise ground equipment.

Type
Time standard
Domain
Scientific connections
Connections
1

Experience system V6

Time standard scientific profile

A graph-grounded scientific layout that adapts to available evidence, imagery, relations, and source coverage.

Evidence graphScientific mapOriginal SVGSource trail
  1. 01

    Observe

    The page falls back to graph and source evidence when no cleared image is available.

  2. 02

    Measure

    Measurement panels use graph coverage, catalog identifiers, and source availability without inventing values.

  3. 03

    Locate

    Associated with International Atomic Time (TAI).

  4. 04

    Connect

    1 graph relation shape the knowledge viewport.

Object type
Time standard
Graph relations
1
Verified sources
1
Image records
0
Domain
Scientific connections
Status
Graph entity

Scientific map

Atlas context

GPS Timecoordinate fields shown only when available
  • Associated with

    International Atomic Time (TAI)

Original SVG diagram

Scientific schematic

Optical pathCollected lightFocal plane / instrumentTime standard
Object class
Time standard
Catalog numbers
Not recorded
Graph relations
1
Sources
1
International Ato...GPS TimeTime standard

Visual knowledge graph

Relationships, not isolated facts

This viewport is generated from the Asteria knowledge graph. Science, culture, and interpretive links remain separated by domain so visual context never changes the evidentiary meaning of a relation.

Continue the atlas

Curated next objects

time standard

International Atomic Time (TAI)

A continuous atomic timescale kept by hundreds of atomic clocks worldwide — the stable foundation from which civil time is derived. TAI never inserts leap seconds, making it ideal for measuring precise intervals.

time standard

Coordinated Universal Time (UTC)

The civil time standard, derived from International Atomic Time but kept within a second of the Earth's rotation by occasional leap seconds. Deep-space tracking tags its measurements in UTC.

time standard

Terrestrial Time

The idealised time on the Earth's surface used as the time axis for astronomical events and geocentric ephemerides. It runs at the same rate as International Atomic Time but is offset ahead of it by a fixed 32.184 seconds, for continuity with the older ephemeris time.

navigation system

Deep Space Atomic Clock

A miniaturised, ultra-stable atomic clock small enough to fly on a spacecraft. By putting precise timekeeping onboard, it enables one-way radiometric navigation — the spacecraft can determine its own position without the round-trip to a ground clock — a technology demonstrated in Earth orbit.

time standard

Apparent Solar Time

Time kept by the real Sun, as a sundial shows it — noon is the moment the Sun crosses the meridian. Because the Earth's orbit is elliptical and tilted, the Sun runs fast or slow through the year, so clocks keep mean solar time instead, differing by up to about a quarter of an hour.

time standard

Barycentric Dynamical Time

The time coordinate of the Solar System barycentre, used as the independent variable of the planetary ephemerides. It differs from Terrestrial Time only by small periodic terms arising from the Earth's motion around the Sun, never drifting by more than a couple of milliseconds.

Data

Scientific data & provenance

Data & provenance

Stable ID
time_standard:gps-time
Type
Time standard
Domain
Scientific connections
Relationships
1
Graph version
1.0.0

Dataset membership

Open data

In the graph export: graph.json · graph.jsonld

Planned API: GET /api/v0/entities/time_standard:gps-time

Scientific quality

Partial
Unreviewed1 sourcev1.0.0

1 of 4 applicable dimensions complete, 2 partial

Description
Complete
Source coverage
Partial
Relationship coverage
Partial
Review coverage
None
Citation coverage
Not applicable
Image coverage
Not applicable
Timeline coverage
Not applicable

Scientific entity. Dimensions that cannot apply to this object are excluded rather than counted as gaps. See the evidence framework and authority dashboard.

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Sources & references

The primary and reference sources this topic draws on.

  • NASANational Aeronautics and Space Administration

    Mission data, planetary science, space telescopes, and public-domain imagery.

    Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.