Earth-Sun Relations Lesson


Vocabulary Exercise
Match the term on the left with the BEST definition on the right.
revolutionlocation of the direct rays of the sun on June 21
orbitwhen the sun's migration reaches its most extreme position

aphelionthe rays of sunlight striking the earth's surface at a 90° angle
perihelionlocation of the tangent rays on the solstices in the northern hemisphere
equatorall of the tangent rays around the earth, separates daylight from darkness
rotationlocation of the direct rays of the sun on the equinox
parallelismcondition of the earth on the far side from the sun beyond the circle of illumination
equinoxlocation of the tangent rays on the solstices in the southern hemisphere
Tropic of Cancerperiod of daylight, determined by the latitude and the position of the direct rays
Tropic of Capricorn motion the earth makes turning on its axis, one day
solstice rays of light striking the earth's surface and continuing off into space
subsolar pointlocation of the direct rays of the sun on December 22
90 rays
direct rays
perpendicular rays
vertical rays
position on the earth's surface where the sun is directly overhead
tangent raysmotion the earth makes around the sun, one year
Arctic Circlethat the earth's axis remains oriented toward the same position in space throughout its complete revolution
Antarctic Circleposition when the earth and sun are closest together, January 3
Circle of Illuminationpath the earth follows in its motion around the sun
darknessangle of the sun's rays striking the earth or the angle between the north-south horizon and the position of the sun in the sky
analemmaposition when the earth and sun are farthest apart, July 4
sun anglegraph showing the position of the direct rays of the sun for every day of the year
length of daywhen the direct rays strike the equator, daylight and darkness are equal in length

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