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celestial event comparison table
Subject has unit has definition is part of occurs on produce has value has location has elongation is a kind of has period
aurora Light radiated by ions in the Earth's atmosphere, mainly near the geomagnetic poles, stimulated by bombardment by energetic particles ejected from the Sun (see solar wind). Aurorae appear about 2 days after a solar flare and reach their peak about 2 years after sunspot maximum.ionosphere   the ionosphere in the polar regions of a planet celestial event 
impact event The collision of two celestial bodies  a crater   celestial event 
periodic celestial event Celestial event which occurs with a very regular period      celestial event 
planetary elongation eventangle unitA point in the orbit of a celestial body with a specific planetary elongation such as 0°, 90° or 180°      planetary elongation 
solar event   Sun    celestial event 

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