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WHY DO THE LENGTHS OF DAY AND NIGHT CHANGE WITH THE SEASON AND LATITUDE?

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Presentation on theme: "WHY DO THE LENGTHS OF DAY AND NIGHT CHANGE WITH THE SEASON AND LATITUDE?"— Presentation transcript:

1 WHY DO THE LENGTHS OF DAY AND NIGHT CHANGE WITH THE SEASON AND LATITUDE?

2 SUN March 21 December 21 N s Equator Antarctic C. Cancer Arctic C. Capricorn June 21 September °N 23.5°N 66.5°S 23.5°S 0° VIEW FROM OVER THE SUN LOOKING DOWN ON EARTH’S NORTH POLE. North Pole (Constant tilt)

3 SUN March 21 December 21 June 21 September 21 VIEW FROM OVER THE SUN LOOKING DOWN ON EARTH’S NORTH POLE. North Pole (Constant tilt) Half of Earth in darkness Circle of Illumination Day/Night

4 SUN March 21 December 21 June 21 September 21

5 SUN March & September 21 June 21December 21 N s Equator Antarctic C. Cancer Arctic C. Capricorn

6 SUN March 21 December 21 N s June 21 September 21 Places in northern hemisphere spend more than half a day in darkness. Proportion of rotation in darkness increases to the Arctic Circle Places in southern hemisphere spend more than half a day in light. Proportion of rotation in daylight increases to the Antarctic Circle December 21 Antarctic Circle Arctic Circle

7 SUN June 21 December 21 March 21 September 21 N s Places in southern hemisphere spend more than half a day in darkness. Proportion of rotation in darkness increases to the Antarctic Circle. Places in northern hemisphere spend more than half a day in light. Proportion of rotation in daylight increases to the Arctic Circle. Arctic Circle Antarctic Circle

8 SUN March & September 21 December 21 N s Equator Antarctic C. Cancer Arctic C. Capricorn N s June 21 N s September 21

9 Latitude Degrees North June Solstice Hours of Daylight March/September Equinox Hours of Daylight December Solstice Hours of Daylight 906 months12hr0 hr 804 months12hr0 hr 702 months12hr0 hr hr12hr0 hr 5016 hr12hr8 hr 4015 hr12hr9 hr 3014 hr12hr10 hr 2013 hr12hr11 hr hr12hr11.5 hr 012hr N s N s Equator Antarctic C. Cancer Arctic C. Capricorn N s

10 THE BOTTOM LINE

11 1. All places at the equator receive 12hrs of daylight and 12hrs of darkness regardless of the season.

12 Latitude Degrees North June Solstice Hours of Daylight March/September Equinox Hours of Daylight December Solstice Hours of Daylight 906 months12hr0 hr 804 months12hr0 hr 702 months12hr0 hr hr12hr0 hr 5016 hr12hr8 hr 4015 hr12hr9 hr 3014 hr12hr10 hr 2013 hr12hr11 hr hr12hr11.5 hr 012hr N s N s Equator Antarctic C. Cancer Arctic C. Capricorn N s

13 THE BOTTOM LINE 1. All places at the equator receive 12hrs of daylight and 12hrs of darkness regardless of the season. 2. On March 21 and September 21 (Equinoxes) all places in the world receive 12 hrs of daylight and 12hrs of darkness regardless of their latitude.

14 Latitude Degrees North June Solstice Hours of Daylight March/September Equinox Hours of Daylight December Solstice Hours of Daylight 906 months12hr0 hr 804 months12hr0 hr 702 months12hr0 hr hr12hr0 hr 5016 hr12hr8 hr 4015 hr12hr9 hr 3014 hr12hr10 hr 2013 hr12hr11 hr hr12hr11.5 hr 012hr N s N s Equator Antarctic C. Cancer Arctic C. Capricorn N s

15 THE BOTTOM LINE 1. All places at the equator receive 12hrs of daylight and 12hrs of darkness regardless of the season. 2. On March 21 and September 21 (Equinoxes) all places in the world receive 12 hrs of daylight and 12hrs of darkness regardless of their latitude. 3. All places lying north of the Arctic Circle (66.5°N) or south of the Antarctic Circle (66.5°S) will experience at least one day of total darkness and one of total daylight.

16 Latitude Degrees North June Solstice Hours of Daylight March/September Equinox Hours of Daylight December Solstice Hours of Daylight 906 months12hr0 hr 804 months12hr0 hr 702 months12hr0 hr hr12hr0 hr 5016 hr12hr8 hr 4015 hr12hr9 hr 3014 hr12hr10 hr 2013 hr12hr11 hr hr12hr11.5 hr 012hr N s N s Equator Antarctic C. Cancer Arctic C. Capricorn N s

17 THE BOTTOM LINE 1. All places at the equator receive 12hrs of daylight and 12hrs of darkness regardless of the season. 2. On March 21 and September 21 (Equinoxes) all places in the world receive 12 hrs of daylight and 12hrs of darkness regardless of their latitude. 3. All places lying north of the Arctic Circle (66.5°N) or south of the Antarctic Circle (66.5°S) will experience at least one day of total darkness and one of total daylight. 4. As one moves geographic position from the equator to the poles the differences in summer and winter lengths of day and night become more extreme.

18 Fairbanks, Alaska, Midday, December 21. Spitzbergen, Norway, Midnight, June 21.

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