Apparent horizon: Difference between revisions

Latest revision as of 21:29, 13 January 2024

The line between the sky and the earth projected on the celestial sphere.

This line is often irregular, due to the earth's topography. On flat surfaces, such as the sea or a level plane, the line approximates a great circle if the observer's elevation above the surface is insignificant and a small circle if the elevation is appreciable.

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+{{Term
+|Display title=apparent horizon
-{{TermHeader}}
+|Definitions={{Definition
-{{TermSearch}}
+|Num=1
+|Meaning=The line between the sky and the earth projected on the [[celestial sphere]].
-<div class="termentry">
+|Explanation=This line is often irregular, due to the earth's [[topography]]. On flat surfaces, such as the sea or  a level plane, the line approximates a [[great circle]] if the observer's [[elevation]] above the surface is  insignificant and a [[small circle]] if the elevation is appreciable.
-  <div class="term">
+}}
-== apparent horizon ==
+}}
-  </div>
-<div class="definition"><div class="short_definition">The line between the sky and the earth projected on the [[celestial sphere]].</div><br/> <div class="paragraph">This line is often irregular, due to the earth's [[topography]]. On flat surfaces, such as the sea or  a level plane, the line approximates a [[great circle]] if the observer's [[elevation]] above the surface is  insignificant and a [[small circle]] if the elevation is appreciable.</div><br/> </div>
-</div>
-{{TermIndex}}
-{{TermFooter}}
-[[Category:Terms_A]]