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periodic celestial event comparison table

Subject	has discoverer	has rate	has discovery date	has definition	occurs on	has location	has parent object	is a kind of	has radiant	has duration	is an instance of	has observer location	has period
active Sun				The Sun during its 11-year cycle of activity when spots, flares, prominences, and variations in radiofrequency radiation are at a maximum.	Sun						solar event		11 years
equinox				Either of the two points on the celestial sphere at which the ecliptic intersects the celestial equator; also the time at which the Sun passes through either of these intersection points; i.e., when the apparent longitude (see apparent place; celestial longitude) of the Sun is 0° or 180°. (See catalog equinox; dynamical equinox for precise usage.)				periodic celestial event					1 year
Forbush decrease	Forbush		1954	A decrease in cosmic-ray intensity during active Sun.	Sun						solar event		11 years
location dependent periodic celestial event				Periodic celestial event which depends on the observers location on the planet				periodic celestial event
meteor shower		the number of meteors observed in a given interval from the observers location		temporary increase in the rate at which meteors are observed when the target runs into a swarm of meteoroids that share a common orbit		which depends on the observer's location on the planet, is it facing the correct direction	the object from which the meteroids originate	periodic celestial event	a location on the sky from which meteor showers seem to originate	a few hours			one year
orbital event				Periodic celestial event in the orbit of a celestial body				periodic celestial event					1 orbital period
solar cycle				The 11-year period between maxima (or minima) of solar activity. Every 11 years the magnetic field of the Sun reverses polarity; hence the more basic period may be 22 years.	Sun						solar event		11 years
solstice				One of the two points on the ecliptic at which the Sun appears to be farthest away from the celestial equator (representing therefore mid-summer or mid-winter).				periodic celestial event					1 year

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