noun
heliocentric parallax
Technical astronomy term; the apparent shift of a celestial object when observed from the Sun versus from Earth. Compare 年周視差 (annual parallax).
See also: 年周視差
日心視差は、太陽を基準にした視差のことです。
Heliocentric parallax is the parallax measured with the Sun as the reference point.
年周視差 is annual parallax (Earth's orbit as baseline), while 日心視差 uses the Sun as the observation point.
Compound of 日心 (heliocentric) + 視差 (parallax). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese astronomical nomenclature.