Transcript Earth In Space - Hicksville Public Schools / Homepage

AIM: Compare rotation to revolution. What causes day and
night?
OBJ: Given notes, video and activity sheet SWBAT explain
the difference between rotation and revolution as well as
what causes day and night with 70% accuracy
DN: Distribute Astronomy Activity Sheet (w/ answer key);
Astronomy Review Sheets (w/ answer key)
ACT: Introduction to Rotation, Revolution (notes)
Complete: What Causes Day and Night? Act. Sheet
HW: Complete Earth in Space Activity Sheet; Astronomy
Exam, Dec 19.
Movement of Earth through Space
Rotation: spinning of planet on its axis
Axis: imaginary line that passes through center of
planet from north pole to south pole
Earth’s Rotation
Rate & Direction:
24 hrs, counterclockwise.
Rotation is the cause of day
and night. Movement:
west→east; sunrise: east,
sunset: west.
side facing sun: day
side facing away from sun:
night
Day vs. Night
Day & Night
http://macmillanmh.com/science/2008/student/na/scienceinmotion/Com
mon/SIM.html?Module=../Grade1/Chapter8-EarthMoves/
Evidence of Rotation:
star trails, sunspot
movement, storm/cloud
movement
Polaris (North Star):
a star that remains
stationary in the night sky
found directly above the
north pole axis.
Sunspot Movement by Rotation
cloud/storm movement by
rotation
Movement of Earth through Space
Revolution: movement of one object around
another object (e.g., earth around sun).
Earth’s Revolution
Rate & Direction:
year (365.25 days),
counterclockwise
Orbit: path of one
object around another
object; elliptical (oval) shaped
Evidence of Revolution: movement of
different constellations seen in the night sky
over the course of a year.
Constellation:
cluster of stars that
form an imaginary
mythological image
READING TIME ZONES
If it is 2 AM in NY, what time is it in California? Boulder
Colorado? Different time zones are the result of _________?
8:47
9:47
10:47
11:47
Do: What Causes Day and Night?
Activity Sheet
The Seasons
Why equator hot and poles cold?
Weather: due to the uneven heating of the earth’s surface
Heat energy
spread out
cooling effect
Heat energy
concentrated
Indirect rays
Direct rays
Indirect rays
Heat energy
spread out
cooling effect
The Seasons
Seasons: winter, spring, summer, fall (autumn);
changes in precipitation and temperature during the year.
Cause of the Seasons: tilt of the earth’s axis
Earth’s Tilt: 23.5° from vertical
0° tilt: spring, fall only
23.5° tilt: moderate temperatures
winter (cold), spring, summer (warm), fall
35°- 45° tilt: extreme temperatures
winter (v. cold), spring, summer (v. hot), fall
IMPORTANT:
north pole axis facing Sun: Summer
north pole axis facing away from Sun: Winter
Seasons NOT caused by change in Earth’s distance from the Sun
Earth farthest from Sun: summer (Northern Hemisphere)
Earth closest to Sun: winter (Northern Hemisphere)
The Seasons
Solstice: shortest or longest day of the year
Northern Hemisphere (NYS)
Summer Solstice - June 21
N.P. axis faces towards Sun
More hours daylight
40°N-45°N: 15 hrs light
________________ opposite ________________
Southern Hemisphere
Winter Solstice – June 21
S.P. axis faces away Sun
Less hours daylight
40°S-45°S: 9 hrs light
The Seasons
Winter Solstice
Dec 21
Away Sun
Summer Solstice
June 21
Towards Sun
Cold
Warm
Cold
Warm
The Seasons
Equinox: equal day & night (12 hours);
1st day spring/fall
March 21, Sept 23 – 12 hour
day everywhere on earth
N.P. axis not facing
towards or away
from Sun
At Equator:
12 hrs daylight
12 hrs darkness
year round;
Sun 90° directly overhead.
The Seasons
Winter Solstice
Dec 21
Away Sun
Summer Solstice
June 21
Towards Sun
Cold
Warm
Cold
Warm
The Seasons
Northern Hemisphere (NYS)
Winter Solstice – Dec 21
N.P. axis faces away from Sun
Less hours daylight
40°N-45°N: 9 hrs light
_____________________ opposite ___________________
Southern Hemisphere
Summer Solstice – Dec 21 (yes, Christmas!!)
S.P. axis faces towards Sun
More hours daylight
40°S-45°S: 15 hrs light
The Seasons
Winter Solstice
Dec 21
Away Sun
Summer Solstice
June 21
Towards Sun
Cold
Warm
Cold
Warm
The Seasons
23.5°N
23.5°S
Summer
solstice
• https://www.youtube.com/watch?v=F1nL_M1G1Xw
Winter
solstice