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Sky Motions. Diurnal Motion. Annual Motion. DIURNAL MOTION

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Sky Motions. Diurnal Motion. Annual Motion. DIURNAL MOTION. Daily East / West motion of the sky ... Due to Earth's orbital motion around the Sun. Sun appears ... – PowerPoint PPT presentation

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Title: Sky Motions. Diurnal Motion. Annual Motion. DIURNAL MOTION


1
Sky Motions
  • Diurnal Motion
  • Annual Motion

2
DIURNAL MOTION
  • Daily East / West motion of the sky
  • Due to the Earths rotation (15/hour)
  • 360/24 hours 15/hour
  • 1 in 4 minutes
  • Stars fall into two groups
  • Circumpolar - never rise or set
  • Equatorial

3
Circumpolar Stars
4
Equatorial Stars
5
View from the North Pole
6
View from the Equator
7
Coordinate System
8
Celestial Meridian
  • Circle going through north and south points on
    the horizon and the zenith

9
Celestial Meridian
  • Objects on the Meridian are at their highest
    point in the sky (transit)
  • Astronomical noon is when Sun is on the Meridian.
  • Does not mean the Sun is directly overhead.
  • Midnight is when the Sun is on the Meridian below
    the horizon.

10
Annual Motion
11
Horizon Calendar
12
The Sky Dome
Sunrises and Sunsets
Polaris
W
On the day of an summer solstice
On the day of an winter solstice
S
On the day of an equinox
N
E
13
Polaris
W
Vernal or Autumnal Equinox
Winter Solstice
S
Summer Solstice
N
E
Starting Points for the Sun
14
Sunrise in Athens
15
Stonehenge
16
Earths Annual Motion
Leo
17
(No Transcript)
18
Suns Motion Tool
19
Inclined Pole causes Seasons
Northern Hemisphere Summer
Northern Hemisphere Winter
20
Suns motion along the Ecliptic
Suns Motion
21
ANNUAL MOTION
  • Constellations move westward during the year.
  • Due to Earths orbital motion around the Sun
  • Sun appears to moves eastward 1/day
  • Path of the Sun called the ECLIPTIC
  • Ecliptic inclined 23.5 to Equator
  • Horizon calendar

22
Annual Motion Affects the Nighttime Sky
900 PM
23
Annual Motion Affects the Nighttime Sky
24
Annual Motion Affects the Nighttime Sky
852 PM
Day 3
25
Annual Motion Affects the Nighttime Sky
900 PM
One Year Later
26
Stars
  • Fixed Stars
  • Modern concept of stars
  • Form the Constellations
  • Planets - traveling or wandering stars
  • Sun, Moon, Mercury, Venus, Mars, Jupiter, and
    Saturn
  • Meteors - shooting stars
  • Comets - long-haired stars

27
Babylonian Astronomy
28
Babylonian Astronomy
Star Charts
29
Babylonian Astronomy
Fatalistic Pre-determinism Everything in nature
pre-determined by the gods Doesnt lend itself to
model building Infinite time line
30
End of Section
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