Earth and the Sun

Earth and the SunEarth Science 2013

• Definition: The study of the ______, ______ and other objects in _____________

Astronomy

• The Sun is the center of our ______________• There are ____ planets in our solar system• We are __________________from the Sun• The Sun is responsible for all the _______ we

receive on Earth

The Sun

Earth

• The ___________ we live on• Only Planet with __________

(that we know of…)• _________ ________ from the

Sun

Earth• The Earth is an _________ planet

___________________________________________________________________________

Earth’s Movements• ____________: One spin on its axis• Takes about ___________to rotate once• This rotation causes _______ and ________• Sun always rises in the _____ and sets in the

________

Earth’s Movements

• _____________ (orbit): One lap around the Sun

• This takes about _________or one year to complete

• The path is not quite a circle; its more of an _______________

Calendars• ______________ mark time on earth in 24

hour days and 365 days per year• The __________ astronomers counted the

days between the appearance of the star Sirius and found an average of 365 days between appearances.

• So the Egyptians came up with one of the first Calendars!

Leap Years• The path of the Earth around the Sun actually

takes ____________to complete.• Every fourth year we add up the extra time

¼ + ¼ + ¼ + ¼ = _________________• This day is added to the calendar every 4 years

on __________________• Leap Years: 2004, 2008, 2012, 2016, 2020,

2024, 2028, etc

Earth’s Tilt

• Earth has seasons because ______ _______as it moves around the Sun

• WE ARE IN THE __________ ____________• When the Northern Hemisphere is tilted

towards the Sun, we get the most sunlight = _____________

• When the Northern hemisphere is tilted away from the Sun, we get the least sunlight = _____________

Seasons

Seasons

• Most places on Earth have 4 distinct seasons: _____________________________________

• The length of each season depends on its location on the Earth and how the _________ hits the Earth

• The __________________of the Earth creates three different climates: tropical, temperate, and polar

Season’s interactive

• Click here

Four Seasons

• Winter Solstice– Starts around _________________– Northern Hemisphere is tilted _________ from

the Sun– The rays from the Sun are the ___________– _______________ day of the year in Northern

Hemisphere; longest day of the year in the Southern Hemisphere

– Marks the beginning of ___________

Four Seasons• Spring Equinox

Starts around _____________The Suns is directly over the _________

creating an equal amount of daytime and nighttime

Marks the beginning of ______________

• Summer Solstice– Starts around _______________– Northern Hemisphere is tilted __________ the

Sun– The rays from the Sun are the ____________– ____________ day of the year in Northern

Hemisphere; shortest day of the year in the Southern Hemisphere

– Marks the beginning of the _____________

Four Seasons

• Autumnal Equinox– Starts around _____________________– The Suns is directly over the ____________

creating an equal amount of ___________ and ______________

– Marks the beginning of ______________

Four Seasons

Climate Zones

The Moon

• The Moon takes ___________ to revolve around the Earth

• The Moon takes 27.3 days to ___________on its axis

• Therefore, we only ever see __________of the moon.

Lunar Landing Sites