29.2 Flashcards
time zone
is an area 15 degrees wide in which the time is the same
rotation
spinning of earth on its axis an imaginary line drawn from earths north pole to south pole
revolution
is the motion of earth in an elliptical orbit around the sun
ecliptic
defined as the plane of earths orbit around the sun
solstice
occurs when the earths rotational axis is tilted directly towered the sun or away from the sun
equinox
earths rotational axis is perpendicular to a line drawn from the center of earths of thr sun.
whi devised a methodof timekeeping around 3000 bc
babiloniens
what was the symbol for degree taken from
Babylonian symbol from sun
how many degrees does the earth spin in a day
360 degrees
how many hours does it take the earth to make one full rotation
24 hours
how many derees does the earth spin in an hour
15
whaqt direction does the sun ride andf set
east west
t or d all the time zones are the exact same size
f bc they are modified tol fit around cities, states and country borders, and other key sites
how many time zones are there in the world
24
which direction do you do you move to add hours on the clock- subtract
east top add an hour
how many time zones are there in the us
6
what are the nemes of the time zones
Atlantic/alas kin Pacific mortician central eastern time zone
whagt is a solor day
sun one day at noon next say
what is a sidereal day
c a crtian star evn it comes over horizen
what are two main reasons for seasons
reilotion tilt of the axis
which 2 seasons have a solstice
winter summer
which month is the summer solcist
june 21
which season is the winter soloist
december
which two seasons are equinox
spring fall
which month is the fall equinox
march
when is the longest day of the year
june 21
when is the shortest day of the year
winter december 21
when re the days almost 12 hours of day and 12 hours of night
spring and fall equnox
march 22
sep 22-23
tide
a rise or fall in the oceans surface
moon phase
reflects the change in appearance of the moon as seen from earth
llunar aclipse
occurs when earth passes between the sun and the moon and casts a shadow on the moon
maria
are the dark colored flat lava filled region on the moons surface
regonlith
is a layer of dusty lunar material produced by collisions between asteroids and comets and the moon
solor eclips
moon between sun and earth
