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XEphem: History, Algorithms and models & Catalogs

XEphem is a Motif based ephemeris and planetarium program for Unix-like operating systems developed by Elwood C. Downey.

Language: English [EN]
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XEphem topic overview

The analysis highlights History, Algorithms and models and Catalogs as prominent areas in the source structure around XEphem.

Related topics
45
Source areas
4
Connected nodes
49
Extracted relationships
41
Related term clusters
21
Bridge connections
49

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Algorithms and models · 30 topics
Catalogs · 7 topics
Overview · 5 topics
History · 3 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Developer
Elwood C. Downey
License
MIT License
Operating system
Unix-like
Release
1990; 36 years ago (1990)
Repository
github.com/XEphem/XEphem
Stable release
4.3.0 / March 6, 2026; 5 months ago (2026-03-06)

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Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

History

Algorithms and models

Catalogs

For the semantics nerds

You can skip this section if you’re here for content ideas and keyword inspiration.

Advanced semantic analysis

How XEphem connects Entity context

The extracted context around XEphem shows recurring relationship patterns in the source. For example, XEphem → Approximation, Bureau, DE200, Jovian, Longitudes, Martian, Meeus, Pluto, Saturnian, Solar System, The VSOP87D, Uranian Another extracted example is XEphem → December, Downey, IBM PC-based, MIT License, Motif, Unix, XEphem's. Use these groups to spot repeated connection types before inspecting the individual relationships.

XEphem

Top relations

related to Algorithms and models · 12
XEphem → Approximation, Bureau, DE200, Jovian, Longitudes, Martian, Meeus, Pluto, Saturnian, Solar System, The VSOP87D, Uranian
related to history · 7
XEphem → December, Downey, IBM PC-based, MIT License, Motif, Unix, XEphem's
related to Catalogs · 5
XEphem → ASCII, HYPERLEDA, Messier Catalog, SKYMAP Master Catalog, Tycho-2
is a · 2
XEphem → client for Internet data sources such as the Digitized Sky Survey, Motif based ephemeris and planetarium program for Unix-like operating systems developed by Elwood C
Developer · 1
XEphem → Elwood C. Downey
License · 1
XEphem → MIT License
Operating system · 1
XEphem → Unix-like
Release · 1
XEphem → 1990; 36 years ago (1990)
Repository · 1
XEphem → github.com/XEphem/XEphem
Stable release · 1
XEphem → 4.3.0 / March 6, 2026; 5 months ago (2026-03-06)

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

downey catalogs elwood motif sky also unix-like planetarium software operating ephemeris version free catalog original github models release system license

XEphem relationships Subject–Predicate–Object triples

TTTA extracted 41 structured relationships around XEphem. Examples in this analysis include XEphem → Developer → Elwood C. Downey and XEphem → License → MIT License. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
XEphemDeveloperElwood C. Downey1.00infobox
XEphemLicenseMIT License1.00infobox
XEphemOperating systemUnix-like1.00infobox
XEphemRelease1990; 36 years ago (1990)1.00infobox
XEphemRepositorygithub.com/XEphem/XEphem1.00infobox
XEphemStable release4.3.0 / March 6, 2026; 5 months ago (2026-03-06)1.00infobox
XEphemTypePlanetarium software1.00infobox
XEphemWebsitegithub.com/XEphem/XEphem1.00infobox
XEphemWritten inC and Motif1.00infobox
XEphemis aMotif based ephemeris and planetarium program for Unix-like operating systems developed by Elwood C0.90text
XEphemis aclient for Internet data sources such as the Digitized Sky Survey0.90text
the Digitized Sky Surveyinstance ofXEphem is a client for Internet data sources0.80text

Related concept clusters Related term clusters

The concept neighborhoods around XEphem bring nearby vocabulary together. In this analysis, examples include Elwood, Catalogs and Downey. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • XEphem
    • Elwood
    • Catalogs
    • Downey
    • Sky
    • Data
    • Ephemeris
    • Github
    • Models
    • Motif
    • Operating
    • Planetarium
    • Solar
  • xephem
    • Elwood
    • Catalogs
    • Downey
    • Sky
    • Data
    • Ephemeris
    • Github
    • Models
    • Motif
    • Operating
    • Planetarium
    • Solar
  • elwood c. downey
    • Downey
    • Elwood
    • Xephem
    • Github
    • License
    • Mit
    • Release
    • Also
    • Sky
    • Software
    • Catalogs
    • Rpms
  • catalogs
    • Also
    • Catalog
    • Hyperleda
    • Includes
    • Subset
    • Tycho-2
    • Xephem
    • Original
    • Sky
    • Elwood
    • Internal
    • Code
  • deep sky objects
    • Observatory
    • Xephem
    • Atlas
    • Catalog
    • Data
    • Digital
    • Hyperleda
    • Includes
    • Moon
    • Planets
    • Solar
    • Subset
  • digitized sky survey
    • Observatory
    • Xephem
    • Atlas
    • Catalog
    • Data
    • Digital
    • Hyperleda
    • Includes
    • Moon
    • Planets
    • Solar
    • Subset
  • guide star catalog ii
    • Includes
    • Subset
    • Tycho-2
    • Internal
    • Catalogs
    • Code
    • Data
    • Hyperleda
    • Observatory
    • Planets
    • Source
    • Free
  • messier catalog
    • Includes
    • Subset
    • Tycho-2
    • Internal
    • Catalogs
    • Code
    • Data
    • Hyperleda
    • Observatory
    • Planets
    • Source
    • Free

Connections between topic areas Semantic bridges

For XEphem, one of the stronger structural bridges in this analysis connects XEphem with Algorithms and models. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
XEphem — Algorithms and models · splits 19 ⟂ 31
XEphem — Catalogs · splits 42 ⟂ 8
XEphem — Overview · splits 44 ⟂ 6
XEphem — History · splits 46 ⟂ 4

Map overview Semantic statistics

XEphem

Nodes50
Edges49
Triples41
Avg. degree1.96
Density0.04
Components1

Source & methodology

TTTA analyzes the structure around XEphem to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Algorithms and models & Catalogs, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — XEphem · EN edition · Analysis: TopicsToTalkAbout

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