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Glite Dictionary
horizontal parallax

horizontal parallax

9.9
The biggest apparent shift of the Moon or a planet seen from Earth at the horizon
  • noun
  • /ˌhɔːrɪˈzɒntəl ˈpærəˌlæks/
  • Specialized
translation icon : paralaje horizontal
  • The horizontal parallax of the Moon is much greater than that of most planets.

Examples

  • Astronomers use the horizontal parallax to calculate the distance to nearby celestial objects.

  • The horizontal parallax of the moon can be measured from various locations.

  • Measuring a planet's horizontal parallax helps determine its actual size and distance.

  • Astronomers often calculate the horizontal parallax to determine distances.

  • Astronomers use horizontal parallax to measure the distances to stars when they appear close to the horizon.

  • By observing the horizontal parallax of stars on the horizon, researchers can accurately assess their distances from Earth.

  • The horizontal parallax allows astronomers to understand how far celestial bodies are when they are just above the horizon.

Surface Forms

horizontal parallax singular
horizontal parallaxes plural

Morphology

horizontal + parallax

The phrase is a straightforward adjective + noun composition: 'horizontal' specifies the direction or orientation of 'parallax', so a learner who knows 'horizontal' (along the horizon) and 'parallax' (apparent displacement) can infer it refers to parallax measured in the horizontal direction. The technical detail that this corresponds to the maximum parallax when a body is on the horizon is a predictable extension of that compositional meaning and follows common adjective–noun semantics cross-linguistically.

Etymology

Horizontal parallax is a name that gives a clear picture: horizontal means along the 'horizon' and parallax is the small shift an object seems to make when you look from different places. So, when the Moon or a planet sits on the 'horizon', astronomers measure that sideways shift to find its 'distance'.