heliometry

== English == === Etymology === From helio- +‎ -metry. === Noun === heliometry (uncountable) (astronomy) The measurement of the diameters of heavenly bodies, their relative distances, etc. by means of a heliometer ==== Related terms ==== heliometer heliometric === References === “heliometry”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.