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physical phenomena > event > celestial event

celestial event
subject			fact

celestial event	has definition Event involving one or more celestial objects
	is a kind of event
event	has duration
	has synonym world point
	has time of occurrence

Kinds of celestial event :

• aurora (3 kinds, 15 facts) - the light produced by excited atoms and ions in the upper atmosphere of a planet, Spectacular array of light in the night sky, caused by charged particles from the Sun hitting the Earth's upper atmosphere. The aurora borealis is seen in the north of the Northern hemisphere; the aurora australis in the south of the Southern., 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.
• impact event (20 kinds, 64 facts) - The collision of two celestial bodies
• periodic celestial event (52 kinds, 181 facts) - Celestial event which occurs with a very regular period
• planetary elongation event (18 kinds, 57 facts) - A point in the orbit of a celestial body with a specific planetary elongation such as 0°, 90° or 180°
• solar event (5 kinds, 30 facts)