Transcript Solstice - East Hanover Schools Online

Happy Haunted Homeroom
October 9, 2012
Today is Tuesday, you have academic and I.S. with
your Period 2 teacher
October 9, 2012 – WARM-UP
Which of the following four diagrams
most accurately depicts the Earth's
orbit around the Sun?
Take out notes page 17
9 The Solar
System from
“Overhead”
• 91,369,000 miles on Jan 4 (minimum)
• 94,776,000 miles on July 4 (maximum)
• average distance is 92,918,000 miles
• Varies +/- about 2% from a perfect circle
When is the Earth closest to
the Sun?
A.
B.
C.
D.
Winter
Spring
Summer
Fall
HMWK – page C27 page 18 in
notebook
1)What causes day and night?
As Earth rotates,
different areas face away
and toward the sun.
HMWK – page C27
2) How are the time zones organized
to help us know times around Earth?
There is a difference of
one hour between each
time zone.
HMWK – page C27
3) How can you tell the difference
between summer and winter by the
sun?
The sun is higher above the
horizon in the summer, and
it remains there longer each
day than in the winter.
HMWK – page C27
4) How is the sun a source of energy
for Earth?
Light from the sun is needed to
grow plants. All other life gets the
Sun’s energy indirectly. The sun
also provides the energy in fuels
and energy for the water cycle.
Earth absorbs some energy from the
sun and changes it to heat that
warms water, land , and the air.
Note Check
• The Earth orbits the Sun
in ___________(revolves)
• The Earth spins around
_______ each day
(rotates)
• The Moon orbits the
Earth about once a month
(revolves)
BRAIN POP!
http://www.brainpop.com/science/weather/seasons/
http://www.youtube.com/watch?v=ndlQNicOeso&feature=re
lated
Kinesthetic Seasons
• Page 19 in notebook
POLARIS???
Polaris - commonly
known as the North
Star is very close to the
north celestial pole
KINESTHETIC SEASONS
Solstices and Equinoxes
Equinox: An equinox is when
the length of day and night
are approximately equal
Ecliptic Plane
Spring Equinox
Solstice: A solstice is either of
the two times of the year
when the sun is at its
greatest distance from the
equator.
Winter Solstice
Fall Equinox
Spring Equinox ~ March 21
Summer Solstice ~ June 21
Fall Equinox ~ September 22
Winter Solstice ~ December 21.
Fall Solstice
Solstices and Equinoxes
The dates of the equinoxes and solstices
are only approximate dates.
– The actual length of a year is about 365
¼ days (365 days, 5 hours, 49
minutes), not exactly 365 days. We
have to add an extra day to a year
every four years to keep the seasons
synchronized with the seasons (leap
year). Over a longer period of time, we
need to skip a leap year to compensate
the extra minutes we add in every leap
year to keep the calendar in sync.
Solstices and Equinoxes
Some exceptions to this rule are
required since the duration of a solar
year is slightly less than 365.25 days.
Years that are integer multiples of 100
are not leap years, unless they are also
integer multiples of 400, in which case
they are leap years.[3][4] For
example, 1600 and 2000 were leap
years, but 1700, 1800 and 1900 were
not. Similarly, 2100, 2200, 2300, 2500,
2600, 2700, 2900 and 3000 will not be
leap years, but 2400 and 2800 will be.