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Astronomy & Telescopes Glossary - IInclination - The angle between the plane of orbit and the plane of the ecliptic. Index Catalog (IC) - A star classification system that supplements to the New General Catalog, which lists nebulae and star clusters with an IC number. Inferior planets - The planets Mercury and Venus are called inferior planets because they are closer to the Sun than Earth. Inner planets - The small, rocky planets that orbit close to the sun: Mercury, Venus, Earth, and Mars. Iridium flare - Bright flashes of light in the night sky that are due to sunlight reflecting off of the mirrors of orbiting Iridium communications satellites. ISS - Abbreviation for the International Space Station. |