Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Jet Propulsion Laboratory Development Ephemeris

Jet Propulsion Laboratory Development Ephemeris (abbreviated JPL DE(number), or simply DE(number)) designates one of a series of mathematical models of the Solar System produced at the Jet Propulsion Laboratory in Pasadena, California, for use in spacecraft navigation and astronomy. The models consist of numeric representations of positions, velocities…

History, Applications & Products

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Jet Propulsion Laboratory Development Ephemeris. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

History

Construction

Distribution

Applications

Ephemerides in the series

Sources

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Jet Propulsion Laboratory Development Ephemeris

Nodes96
Edges95
Triples6
Avg. degree1.98
Density0.020833
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Important terminology Word statistics

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

Important terminology

ephemeris jpl observations data ephemerides spacecraft created moon mars planets released pluto years de405 included covered time astronomical fit positions

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
these were run by large organizations with ample resourcesinstance ofand numerical integrations0.80text
planetary massesinstance ofThe initial conditions were both constants0.80text
from outside sourcesinstance ofThe initial conditions were both constants0.80text
and parameters such as initial positionsinstance ofThe initial conditions were both constants0.80text
velocitiesinstance ofThe initial conditions were both constants0.80text
adjusted to produce output which was ainstance ofThe initial conditions were both constants0.80text

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.