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Solar Glossary ...

Aphelion of Earth
The Aphelion occurs when a planet is furthest to the Sun during its slightly elliptical orbit.
Astronomical UnitA measurement of distance equal to the distance from the Sun to the circular orbit of a Fictious Mean Earth or about 92,955,807 miles.
AuroraLight emission in the sky around the north and south poles caused by charged particles from the solar wind hitting the Earth magnetic field.
CoronaThe tenuous outmost part of the solar atmosphere.
EclipticThe imaginary line across the sky representing the path of the Sun during the year. For practical purposes, it represents edge of the solar system. The Sun, Moon and all the planets, except Pluto, appear to travel along the ecliptic. The Ecliptic also intersects with the 13 zodiacal constellations.
EquinoxThe Equinox is a point in the Earth's orbit where the tilt of the Earth lies on the same plane as the tangent of the Earth's orbit. There are two Equinoxes each year which marks the beginning of the Spring and Autumn seasons. Literally meaning 'Equal Night', Daylight and nighttime are of equal length on the Equinoxes. Like the Solstices, the Seasons between the Northern and Southern hemispheres are opposite of each other: The Vernal Equinox in the North occurs with the Autumnal Equinox in the South and visa-versa. The Equinoxes are counter pointed by the Summer and Winter Solstices.
FaculaA calcium cloud in the Sun's chromosphere, seen in projection against the photosphere in white light and detectable most easily near the Solar limb.
FilamentsA solar prominence seen in projection against the Sun's photosphere.
FlaresA brief, sudden brightening in the sun's atmosphere that accompanies a burst of radiation from a sunspot.
HeliometerAn instrument devised originally for measuring the diameter of the sun; now employed for delicate measurements of the distance and relative direction of two stars too far apart to be easily measured in the field of view of an ordinary telescope.
Perihelion of Earth
The Perihelion occurs when a planet is closest to the Sun during its slightly elliptical orbit.
PhotosphereThe luminous surface layer of the Sun.
Sidereal TimeTime measured by the daily motion of stars.
SolSol is the name of our sun, the star at the center of our solar system. It is about 4.37_106 km in diameter and has a magnitude of -26.
SolarHaving to do with the Sun
Solar FiltersFilters that allow safe viewing of the sun through a telescope.
Solar FlaresA sudden temporary outburst of energy from a small area of the Sun's surface.
Solar ProminenceAn eruption of relatively cool, high-density gas from the solar chromosphere into the corona.
Solar Prominence FiltersA specialized solar filter that reveals prominences by selecting the light of the hydrogen-alpha atom.
SolsticeThe Solstice is a point in the Earth's orbit where the tilt of the Earth points directly toward and away from the Sun. There are two Solstices each year: In the hemisphere where the tilt is toward the Sun, that would be the Summer Solstice for the hemisphere. In the hemisphere where the tilt is away from the Sun, that would be the Winter Solstice. The Summer Solstice is the day with the least amount of nighttime and the longest amount of daytime and marks the beginning of Summer. The Winter Solstice is the day with the longest amount of nighttime and the least amount of daytime and marks the beginning of Winter. The Solstices are counter pointed by the Vernal and Autumnal Equinoxes.
Spectral LineA dark or bright line at a specific wavelength in a spectrum.
SpectrohelioscopeA spectroscope equipped with a synthesizer that produces a narrow-bandpass image of the sun's disk in hydrogen-alpha, hydrogen-beta, sodium, calcium or other selected wavelengths of light.
SpectroscopyThe physics that deals with the theory and interpretation of electromagnetic radiation.
SpectrumSeparation of light into its component wavelengths.
SpiculaeA spike-like short-lived prominence appearing near the chromosphere.
SpiculeA short-lived spike-like solar prominence.
White LightVisible light that includes all colors and, therefore, all visible wavelengths. A mixture of all wavelengths of the visible spectrum.
White Light FiltersThe most common type of solar filter, composed of Mylar or glass, that rejects almost all light across the entire spectrum. These filters work well for viewing the sunspots, photosphere granulation, solar limb darkening, calcium clouds in the solar chromosphere, the twenty-five day solar rotation period and events like solar eclipses and Mercury and Venus transits.
It is never a good idea to view the Sun without eye protection.  It is an especially bad idea to view the Sun though optics like a binocular or telescope without protection as you will do damage to your equipment and your eyes.
Woodland Hills Camera & Telescopes
Information on the Hosting Grant Program sponsored by Woodland Hills Camera and