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.
Position for the simulation time
Venus'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.
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
Venus: mean radius 6,051.8 km; mass 4.868 × 10^24 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.
Clouds or microwave measurements
Cloud cover is an approximation; the Magellan view is a scientific measurement layer.
MethodThis describes the displayed appearance only; it does not certify catalog dimensions, orbital elements or unobserved geology.
Look beneath Venus’s clouds
Magellan microwave emissivity is a measurement layer, not a visible-light photograph. The ordinary cloud-covered globe is a visual approximation.
MethodSource maps are compared with a physical globe or rings under simulated illumination. The image and camera view are not registered.
LimitTransparent areas in this source image have no measurement. The 3D map marks them gray-blue; no terrain is invented.
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.
Space Time