Construct · 5 fields · 5 citations

Where does horizon collide?

One name. Different field. Different construct. One map.

● jingle · one word, five constructs Nearest construct by meaningevent horizoncompare the meanings
How to read this

Every construct on the map is compared with every other by the meaning of its definitions, and the closest one is surfaced here. The nearest construct to horizon is event horizon.

Hold this as a prompt, not a verdict. Two constructs sitting close in meaning is a reason to read them side by side and decide for yourself whether they are one idea under two names. It is not proof that they are. Compare the meanings in the Collider.

horizon5 CONSTRUCTSSoil horizonHARTEMINK · SOIL PROFILEEvent horizonEHT · BLACK-HOLE EDGEHorizon of meaningGADAMER · FUSED HORIZONSTime horizonSAMUELSON · PLANNING SPANHorizonWILLEY · ARCHAEOLOGY

Spokes are fields; dashed arcs are shared lineage. Tap a field for its definition, unit, and measures.

1958Horizon1960Horizon of meaning1969Time horizon2019Event horizon2020Soil horizon
2026

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Soil science and pedology

A layer of the soil profile

A layer of soil lying roughly parallel to the ground surface, distinguished from the layers above and below it by its colour, texture, structure, or composition: a vertical section through the soil, exposed in a pit, shows a sequence of these horizons, labelled with master letters such as O for surface organic matter, A for the dark topsoil, B for the subsoil where materials accumulate, and C for the weathering parent material. Hartemink and colleagues' 2020 review Soil horizon variation surveyed how these horizons are recognised, designated, and how much they vary within a soil. The referent is a physical stratum of ground, described by depth and boundary, not an edge in spacetime, a background of understanding, or a stretch of future time.[1]

Unit
A layer of soil roughly parallel to the surface, marked by a master letter such as O, A, B, or C
Recovery means
Not applicable
Measured by
Described in the field by digging a soil pit and recording each horizon's depth, colour, texture, structure, and lower boundary

Astrophysics and general relativity

A black hole's boundary of no return

The boundary surrounding a black hole beyond which nothing, not even light, can escape to the outside: it is not a solid surface but a one-way threshold in spacetime, its radius set by the hole's mass, and an outside observer can never see any event that happens within it. The Event Horizon Telescope Collaboration's 2019 paper First M87 Event Horizon Telescope results reported the first image of the bright ring and dark shadow cast by the region just outside such a horizon at the centre of galaxy M87. The referent is a boundary in gravity's geometry, inferred from what light does near it, and it has nothing in common with a layer of soil, a background of meaning, or a span of planning time.[2]

Unit
A one-way surface around a black hole, its radius fixed by the hole's mass
Recovery means
Nothing that crosses it can return to the outside universe
Measured by
Inferred from the size of the dark shadow and bright emission ring imaged around the hole by very-long-baseline radio interferometry

Phenomenology and hermeneutics

The background against which meaning appears

The encompassing background of prior understanding, assumption, and possibility against which anything at all shows up as meaningful: whatever is grasped is grasped from somewhere, within a range of what can be seen and expected, and that range is one's horizon. Gadamer's 1960 Truth and Method developed the idea that understanding another text or person is a fusion of horizons, in which one's own background of meaning is widened by meeting theirs. The referent is a structure of interpretation, drawn out in reflection and dialogue, and it is not a layer in the ground, a boundary in spacetime, or a measured length of future time.[3]

Unit
A background of prior understanding within which something shows up as meaningful
Recovery means
Not applicable
Measured by
Not measured; it is drawn out through interpretation and dialogue rather than quantified

Finance and decision-making

The length of a plan's future

The length of the future period taken into account in a plan, decision, or investment: a saver choosing how to hold wealth, or a firm weighing a project, fixes some span of time over which outcomes are considered, and choices that look best over a short horizon can look poor over a long one. Samuelson's 1969 Lifetime portfolio selection by dynamic stochastic programming worked out how an investor should allocate wealth over a finite or lifelong horizon, showing how the length of that horizon shapes the decision. The referent is a chosen stretch of future time, counted in periods or years, and it is unrelated to a soil layer, a black hole's edge, or a background of understanding.[4]

Unit
The length of the future period a plan or investment looks ahead over, in periods or years
Recovery means
Not applicable
Measured by
Set as the number of periods or years over which outcomes are planned, discounted, and evaluated

Archaeology

a set of cultural traits spread widely over space in a short time, used to link sites across a region.

In archaeology, horizon refers to a set of cultural traits spread widely over space in a short time, used to link sites across a region. This meaning comes from Willey (1958) in Method and theory in American archaeology.[5]

Unit
Recovery means
Measured by

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Nearby collisions

prior3 fields · 4 citationsjingle · one word, three constructsframing4 fields · 8 citationsjingle · one name, four constructs

References

  1. Hartemink, A. E., Zhang, Y., Bockheim, J. G., Curi, N., Silva, S. H. G., Grauer-Gray, J., Lowe, D. J., & Krasilnikov, P. (2020). Soil horizon variation: A review. Advances in Agronomy, 160, 125–185. https://doi.org/10.1016/bs.agron.2019.10.003
  2. Event Horizon Telescope Collaboration. (2019). First M87 Event Horizon Telescope results. I. The shadow of the supermassive black hole. The Astrophysical Journal Letters, 875(1), L1. https://doi.org/10.3847/2041-8213/ab0ec7
  3. Gadamer, H.-G. (2004). Truth and method (2nd rev. ed., J. Weinsheimer & D. G. Marshall, Trans.). Continuum. (Original work published 1960)
  4. Samuelson, P. A. (1969). Lifetime portfolio selection by dynamic stochastic programming. The Review of Economics and Statistics, 51(3), 239–246. https://doi.org/10.2307/1926559
  5. Willey, G. R. (1958). Method and theory in American archaeology. University of Chicago Press. ISBN 9780226898889

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