R🜨

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Translingual

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Alternative forms

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  • R [a common typographic substitution, as mathematical was supported by Unicode a decade before astronomical 🜨]
  • The R is not always italic.

Etymology

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  • R (radius) and subindex 🜨 (planet Earth).

Symbol

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R🜨

  1. (astronomy) Earth radius: a unit of distance, equal to the radius of the Earth, or 6370 km.
    the transition radius of 2.6 R🜨 between water worlds and planets with gaseous envelopes
  2. (sum of parts) The radius of the Earth specifically.

Usage notes

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  • R🜨 may be distinguished from r🜨, the latter not a unit of measurement but meaning radial distance from the Earth (geocentric distance). Unlike R🜨, r🜨 is used relative to our planet specifically.

Synonyms

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  • (2): R (R is apparently uncommon as a comparative unit of measurement)
  • (English) RE