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Weather Map High = Happy Weather (any temperature but no rain) Low = Lousy Weather (any temperature and rain) Precipitation before warm front Stormy weather before cold front
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Monday, March 16, 2015A week ago, we changed our clocks one hour forward in order to save daylight at the end of the day.
What effect does daylight savings have on the number of daylight hours? Write this question and your answer in your journal.
Monday, March 16, 2015A week ago, we changed our clocks one hour forward in order to save daylight at the end of the day.
What effect does daylight savings have on the number of daylight hours?
NONE!!!
The days continue to get longer because the northern hemisphere is starting to tilt towards the sun. Daylight savings is just causing it to be darker in the morning than in the evening. The days are continuing to get longer regardless of daylight savings time.
Weather MapHigh = Happy Weather (any temperature but no rain)
Low = Lousy Weather (any temperature and rain)
Precipitation before warm front
Stormy weather before cold front
What do you already know?The sun has the following
effects on earth:
Heats the earth’s surface & atmosphere
Lights half of the earth’s surface at a time.
Influences winds & water cycle.
ROTATION
The spinning of Earth on its axis that causes day and night to occur
How fast does Earth rotate?https://
www.youtube.com/watch?v=UVuqcEuIRgs
1,675 km/hour, 465 meters/second.
AXIS
The imaginary line extending from the North Pole to the South Pole going through the center of Earth, which is the center of Earth’s rotation.
ROTATION 24 HOURSOne complete spin/rotation takes 24 hrs
North Pole always faces Polaris, the North Star
23.5 DEGREESThe slant of Earth’s axis, which is 23.5° from
vertical
NUMBER OF HOURS OF DAYLIGHT Depends on location on Earth
The number of hours of daylight received each day depends on the latitude.
The equator receives about 12 hours of daylight all year long
DAYLIGHT HOURS
The earth’s tilt on its axis remains constant throughout
the year.
SeasonsAs the Earth revolves around the Sun, the tilt
sometimes points toward the Sun, sometimes away from the Sun, and sometimes neither away nor toward the Sun
Earth is actually closer to the Sun when the Northern Hemisphere is experiencing winter!
Spring Summer Autumn (Fall) Winter March 21 June 21 September 21 December 21
SEASONS in NORTHERN HEMISPHERE
Summer vs. Winter
Seasons: Summer(Northern HemispherePosition of the Earth is such that the northern
hemisphere is tilted toward the SunSummer Solstice (1st day of summer)
Sun at highest point (over Tropic of Cancer)Most hours of sunlight (longest day)About June 21
Seasons: Winter(Northern Hemisphere)Position of the Earth is such that the
northern hemisphere is tilted away from the Sun
Winter Solstice (1st day of winter)Sun at lowest point (over Tropic of Capricorn)Fewest hours of sunlight (shortest day)About December 21
Seasons: Spring(Northern Hemisphere)Position of the Earth is such that the northern
hemisphere is tilted neither towards nor away from the Sun
Vernal Equinox (1st day of spring)About 12 hours of sunlightAbout March 21
Summing Up:
Winter - Earth tilted away from Sun, fewer hours of sunlight, less direct sunlight (insolation)Spring – Earth neither tilted away nor toward the Sun, equal hours of daylight and nightSummer – Earth tilted toward the Sun, more hours of daylight, more direct sunlight (insolation)Fall - Spring – Earth neither tilted away nor toward the Sun, equal hours of daylight and night
TEST on Thursday!
Watch this animation:
http://www.shsu.edu/%7Echm_tgc/sounds/flashfiles/earth.swf
Choices for your TableEvent: Solstice or Equinox
Seasons: Winter, Spring, Summer, or Fall (Autumn)
# Daylight Hours (NH): Longest daylight hours, Shortest daylight hours, or Equal hours of day and night everywhere
Latitude: 23.5o N (Tropic of Cancer), Equator, or23.5o S (Tropic of Capricorn)
Diagram: