Saturn: evidence and sources

Saturn

Second largest planet. Famous for its prominent ring system. Its diverse moons include Titan, with a thick atmosphere, and ice-covered Enceladus.

astronomy-engine Position basis, the same label the app shows on the selection card.

Every aspect, with its origin

One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.

ObservedCatalogComputedReconstructedIllustrativeUndocumented

Position Computed

Position for the simulation time

Saturn's position is computed for the simulation instant by astronomy-engine, an analytic ephemeris model. There is no snapshot to age: the same code gives the same answer for any date.

Sourceastronomy-engine

Methodastronomy-engine (analytic planetary and lunar model; Sun through Pluto and the Moon)

UncertaintyRoughly arcminute-level against JPL ephemerides for 1700 to 2200; fixture tests compare selected dates with Horizons.

LimitPositions in the 3D scene are heliocentric J2000 equatorial coordinates; observer-facing tables are apparent, of date, and topocentric (see the frame statements).

Physical data Undocumented

Bulk properties

Saturn: mean radius 58,232 km; mass 5.683 × 10^26 kg. These values are bundled with the object record and drive the rendered size.

SourceBundled object record

LimitThe object catalog does not record where these values came from; treat them as unverified until the record is completed.

Appearance Reconstructed

Cloud map · measured ring profile

Cloud motion is modeled. Ring illumination and shadows follow the Sun; the ring texture represents measured structure.

SourceAppearance source and method

MethodThis describes the displayed appearance only; it does not certify catalog dimensions, orbital elements or unobserved geology.

Appearance Reconstructed

The structure of Saturn’s rings

An unwrapped Solar System Scope display texture. The live rings additionally use a Cassini-derived radial density profile. The globe’s lighting, shadows and ring particles are modeled. This map is not registered to the current camera.

SourceSolar System Scope / INOVE · CC BY 4.0 display texture

MethodSource maps are compared with a physical globe or rings under simulated illumination. The image and camera view are not registered.

LimitMap pixels describe appearance, not measured terrain height. Brightness and color may be adjusted for display.

Description Undocumented

Description and facts

The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.

SourceSpace Time editorial text

LimitBackground reading is linked under Further reading; it is not the source of the displayed numbers.

Engine and frame

Engine: astronomy-engine (analytic planetary and lunar model; Sun through Pluto and the Moon)
Frame (3D scene): heliocentric J2000 equatorial positions from astronomy-engine, rotated into the scene's ecliptic basis
Frame (tables): RA/Dec are apparent, of date (true equator and equinox of the instant), with annual aberration applied; not J2000
Origin: topocentric for the chosen observer (distance is observer-to-body, not geocentric)
Refraction: altitude includes standard atmospheric refraction (astronomy-engine "normal" model); azimuth is unaffected
Magnitude: astronomy-engine Illumination(): phase-dependent planetary magnitudes (Mercury and Venus per Hilton 2005), Saturn includes ring tilt, Moon and Sun use its built-in curves; no atmospheric extinction
Size: angular diameter from IAU equatorial radii and the topocentric distance
Constellation: IAU boundaries evaluated on the position precessed back to J2000

What is not measured

Appearance: a reconstruction from measurements, not a direct observation. Cloud map · measured ring profile. Cloud motion is modeled. Ring illumination and shadows follow the Sun; the ring texture represents measured structure.
Appearance: a reconstruction from measurements, not a direct observation. The structure of Saturn’s rings. Map pixels describe appearance, not measured terrain height. Brightness and color may be adjusted for display.

Dataset freshness

Snapshots this page depends on, read from the generated manifests at request time.
Dataset	Last refreshed	Horizon	Automated
Sun, Moon and planet positions astronomy-engine (analytic ephemeris model)	no snapshot date	Valid roughly 1700 to 2200 at arcminute level; no snapshot to age	Not applicable (analytic model) npm dependency