katie science earth in space

Question Answer
astronomy the study of the moon, stars and other objects in space
why does it seem that the sun and moon move across the sky each day because earth is rotating on its axis
axis the imaginary line that passes through earths center and the north and south poles
where does the north end of the axis point in space toward? Polaris, the North star
rotation earths spinning on its axis
what causes day and night earts rotation
as earth rotates eastward what does the sun appear to do move westward across the sky
what side of earth has the day time the side of the earth that faces the sun
what happens as earth continues to turn to the east the sun appears to set in the west
what is the side of the earth that is night the side of the earth that the sun cant reach
how long does it take earth to rotate once on its axis 24 hours
what is a 24 hour cycle of day and night called its called a day
revolution the movement of one object around another object
year one complete revolution around the sun
orbit earths path as it revolves around the sun
is earths orbit a circle? no its a slightly flattened circle or oval shape
why do the sun and moon appear to move each day? because the earth is rotating on its axis
what causes day and night earths rotation causes day and night
what causes the cycle of seasons on earth because earths axis is tilted as it moves around the sun
how long does earths orbit take 365 1/4 days
how many days are there in a year 365 for 3 years , then 366 days once every four years "leap year"
leap year once every four years 366 days in a year that year
what happens during a leap year an extra day is added to February, giving February 29 days instead of 28 days
why is it warm near the equator than near the poles because sunlight hits earths surface directly and is less spread out
why is it cooler near the poles than the equator because at the equator the sun hits the earth at more of an angle and therefore the sunlight is more spread out
what season is it when the north end of the axis is tilted toward the sun that is when the northern hemisphere has summer and the southern hemisphere has winter
when the north end of the axis is tilted toward the sun what is happening at the southern end that is when the southern hemisphere has winter and the earths axis is tiled away from the sun
are summer and winter affected by changes in earths distance from the sun? NO! in fact when the northern hemisphere is having summer earth is actually at its greatest (biggest) distance from the sun
what angle is earths axis from the vertical 23.5 degree angle
what happens during late june solstice the north end of earths axis is tilted toward the sun. it is summer in the northern hemisphere and winter in the southern hemisphere. Noon sun vertical at 23.5 degrees north
what happens during September and march equinox neither end of earths axis is tilted toward the sun. both himispheres receive the same amount of energy
what happens during late December solstice the south end of earths axis is tilted toward the sun. it is summer in the southern hemisphere and winter in the northern hemisphere
noon sun vertical at 23.5 south
what happens during march equinox noon sun vertical at equator
latitude a measurement of distance from the equator, expressed in degrees north or south(the equator has latitude 0 and north pole has latitude 90 north)
which hemisphere has more hours of daylight the hemisphere that is tilted toward the sun has more hours of daylight than the hemisphere that is tilted away from the sun
earth in june (north) -north end of earths axis is tilted toward the sun
-noon sun is directly overhead at 23.5 north
-combination of direct rays and more hours of sunlight heat the surface more than any time of the year so it is summer in the northern hemisphere
earth in june (south) -sun energy is spread over a large area
-fewer hours of daylight
-indirect rays and fewer hours of sunlight heat earths surface less than any other time. it is WINTER in southern hemisphere
earth in december December 21 the noon sun is overhead at 23.5 south latitude
-people in south hemisphere receive the most direct sun so its summer there
-sun rays in the northern hemisphere are indirect and there are few hours of daylight. winter in north hemisphere
both june and decmber 2 days each year noon sun is overhead at either 23.5 south or 23.5 north
-called the solstice
december solstice -the day when the non sun is overhead 23.5 south
-winter solstice in the northern hemisphere
-summer solstice in the sourthern hemisphere
-shortest day of the year in the northern hemisphere
-longest day of the year in souther hemisphere
june solstice -noon sun overhead at 23.5 north
-summer solstice in the northern hemisphere
-winter solstice in the southern hemisphere
earth in march and September (EQUINOX) -equinox
-2 days a year
-neither hemisphere is tilted toward or away from the sun
-noon sun is directly overhead at the equator
-nighttime and daytime are about the same
vernal equinox march 21
-marks spring in northern hemisphere
autumnal equinox -around 9/23
-marks beginning of fall in northern hemisphere

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