helio-, heli- +

(Greek: sun)

anheliophile
Any creature which thrives in diffuse sunlight.
anheliophilous
Thriving in diffuse sunlight.
anheliophily
The process of thriving in diffuse sunlight.
aphelion
The point in the orbit of a celestial body; such as, a planet or comet that is at the greatest distance from the sun.
apheliotropic
Turning or growing away from the sun; said of leaves, etc.
apheliotropism, aheliotropism
A tendency to bend or to turn away from sunlight; especially, with reference to the leaves of plants.
diaheliotropic (adjective)
Relating to, or showing, movement of the leaves of plants that follow the sun so they remain perpendicular to the sun's rays throughout the day.
diaheliotropism (s) (noun), diaheliotropisms (pl)
A tendency of leaves, or other organs, of plants to have their outer surface facing towards sunlight.
helioaerotherapy
The treatment of disease by exposure to sunshine and fresh air.
heliocentric
1. Centered on the sun.
2. Having to do with or based on the heliocentric theory.
heliocentric coordinates
A coordinate system (rule for designating each point in space by a set of numbers) relative to the sun as a center.
heliocentric theory
The principle that the earth and other planets revolve around the sun: following the work of Copernicus in the 16th century.

This replaced the earlier geocentric (earth-centered) system described by Ptolemy (c. A.D. 100-170).

Ptolemy was a Greek philosopher who presented a widely accepted model of the solar system known as the "Ptolemaic system". He also made important contributions to geography and cartography.

The "Ptolemaic system" was a theory developed by Ptolemy, about A.D. 150, maintaining a motionless earth is the center of the universe with sun, moon, and planets revolving, around it; while the fixed stars are attached to an outer sphere concentric with the earth. This model was generally accepted in the West until the establishment of the "Copernican theory" about 1500 years later.

Nicolaus Copernicus (1473-1543), is the Latinized version of the name Mikolaj Kopernik, the Polish astronomer who established the heliocentric model of the solar system; that is, the principle that the sun (not the earth) is the central point to which the motions of the planets are to be referred.

Copernicus was recognized as the first person in history to create a complete general arrangement of the solar system (Copernican system); combining mathematics, physics, and cosmology.

heliochemical
Characterized by green plants which convert energy from the sun into chemical energy via photosynthesis.
heliochemistry
Converting energy from the sun to chemical energy; especially, by the process in which green plants utilize solar energy through photosynthesis.
heliodon
A device used to simulate the angle of the sun which is used to assess the shading potentials of building structures or landscape features.

Related "sun" word family: sol-.