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II. _________ of the these Apparent Motions: a/ The Sun moves across the sky at ________due to - PowerPoint PPT Presentation


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Causes. II. _________ of the these Apparent Motions: a/ The Sun moves across the sky at ________due to Earth's _______________. b/ Its path changes each day due to a ________________ of 2 Reasons:. 15 0 /h. rotation. combination. Reason #1 : ________________________________________.

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Causes

II. _________ of the these Apparent Motions:

a/ The Sun moves across the sky at ________due to

Earth's _______________.

b/ Its path changes each day due to a ________________

of 2 Reasons:

150/h

rotation

combination

Reason #1: ________________________________________

Revolution of Earth around the Sun

definitions:

the orbiting of one celestial body

around another

Revolution - ___________________________________

___________________________________

the time required to complete

one revolution

period of - ___________________________________

revolution ___________________________________


view from above:

(not to scale)

ellipse

Sun

E

foci

10

___/day

3600

1 revolution = _________

period of revolution = _________

365 days

0.990/day

10/day

3600

rate of = ________________ = ________

revolution ≈ _______

365 days


tilted

Reason #2: Earth's axis stays ____________ at an angle

of _________with respect to its _______________________

_______.

orbit around the

23.50

Sun

spring (vernal)

_______________

23.50

equinox

E

Sun

winter

__________

E

E

summer

__________

solstice

solstice

E

fall (autumnal)

_______________

equinox

Rotation axis


Summer

Solstice

in NY –

Sun is ________

_______________

_______________

Z

almost

overhead

(close to Z)

NYS

Sun's

Rays

Z

Winter

Solstice

in NY –

Sun is ________

_______________

_______________

NYS

Sun's

Rays

lower

in the sky

(far from Z)


completes 1 arc

In Sum: 1/ Rotation  Sun __________________________

2/ Axis tilt + revolution  ___________paths on

___________ days

3/ Earth is spherical  arcs are _____________

different

different

tilted

Polaris

Z

altitude

=

latitude

W

S

N

E


III. Consequences

Earth's night side

faces in different directions during the year, making

it possible to see different constellations at night.

A. Because of revolution, _________________________

____________________________________________________

____________________________________________________

A group of stars that form patterns

of imaginary things such as animals, heroes and

mythical gods, and other objects

Constellation: - ___________________________________

___________________________________________________

___________________________________________________

pattern

seen from

Earth

Actual stars of

constellation are

_______________

_______________

___________

___________

_________:

at different

distances

Earth


midnight

away from the Sun

At ____________ , you are looking _______________________

summer


Sagittarius,

Scorpius

Capricornus


midnight

away from the Sun

At ____________ , you are looking _______________________

summer

fall


Pisces

Aquarius

Aries


midnight

away from the Sun

At ____________ , you are looking _______________________

summer

winter

fall


Cancer

Gemini

Taurus


midnight

away from the Sun

At ____________ , you are looking _______________________

spring

summer

winter

fall


Virgo

Libra

Leo


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