Happy Haunted Homeroom

October 9, 2012

Today is Tuesday, you have academic and I.S.

with your Period 2 teacher

October 9, 2012 – WARM-UPWhich of the following four diagrams most accurately depicts the Earth's orbit around the Sun?

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

Take out notes page 17

When is the Earth closest to the Sun?

A. WinterB. SpringC. SummerD. Fall

HMWK – page C27 page 18 in notebook

1)What causes day and night?

As Earth rotates, As Earth rotates, different areas face away different areas face away and toward the sun.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 There is a difference of one hour between each one hour between each time zone.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 The sun is higher above the horizon in the summer, and horizon in the summer, and it remains there longer each it remains there longer each day than in the winter.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 Light from the sun is needed to grow plants. All other life gets the grow plants. All other life gets the Sun’s energy indirectly. The sun Sun’s energy indirectly. The sun also provides the energy in fuels also provides the energy in fuels and energy for the water cycle. and energy for the water cycle. Earth absorbs some energy from the Earth absorbs some energy from the sun and changes it to heat that sun and changes it to heat that warms water, land , and the air.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=related

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

Solstice: A solstice is either of the two times of the year when the sun is at its greatest distance from the equator.

Ecliptic Plane

Spring Equinox

Fall Equinox

Winter Solstice

Fall SolsticeSpring Equinox ~ March 21Summer Solstice ~ June 21Fall Equinox ~ September 22Winter Solstice ~ December 21.

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.