Heliometry

(n.) The apart or practice of measuring the diameters of heavenly bodies, their relative distances, etc. See Heliometer.

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Newtonian physics, acoustics, actinology, actinometry, aerophysics, applied physics, astrophysics, basic conductor physics, biophysics, catoptrics, chemical physics, cryogenics, crystallography, cytophysics, dioptrics, electron optics, electron physics, electronics, electrophysics, geometrical optics, geophysics, heliography, heliology, heliometry, infrared spectroscopy, macrophysics, mathematical physics, mechanics, medicophysics, microphysics, microscopics, microscopy, natural philosophy, natural science, nuclear physics, optical physics, optometry, philosophy, photics, photography, photology, photometry, physic, physical chemistry, physical optics, physical science, physicochemistry, physicomathematics, physics, psychophysics, radiation physics, radionics, solar physics, solid-state physics, spectrometry, spectrophotometry, spectroscopy, statics, stereophysics, stereoscopy, telescopy, theoretical physics, thermodynamics, zoophysics