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Enjoying the Night Sky.

Published byDana Elliott Modified over 6 years ago

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Presentation on theme: "Enjoying the Night Sky."— Presentation transcript:

1 Enjoying the Night Sky

2 Horizon and Zenith It is sometimes useful to think of the sky as a great dome over our heads. The horizon is where the dome meets the Earth. The zenith is the point directly overhead. As the Earth turns, this dome turns over our heads. It appears as if the sky is a large hollow sphere centered on the Earth.

3 Stars and constellations

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12 Zodiac Constellations
The Constellations on the Ecliptic As the Earth revolves about the Sun, the Sun appears to move through a set of constellations called the zodiac. The path of the Sun through the sky is called the ecliptic.

13 Astrophotography All you need: 35 mm Camera on tripod
Cable shutter release F-stop on smallest number Focus to infinity Fast film (at least 400 speed) Aim the camera, and hold shutter open for 10-30 seconds for constellations As long as you want for star-trails

14 Star-trails Motion of the stars
Just like the Sun and Moon the stars rise and set due to the rotation of the Earth. They rise in the East and set in the West. Stars near the celestial poles do not rise or set. Instead the circle the poles and are called circumpolar.

15 Circumpolar star-trails

16 Why the trails?

17 Sagitarrius and Milky Way: 30 second exposure

18 Wandering Stars: the planets
The ancients knew of seven objects that wandered through the stars (the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn). They called these wanders the “planets” (from the Greek for wanderer). All of these objects are visible with the naked eye.

19 Cartes du Ciel

20 Sky and Telescope on line

21 The Moon

22 Earth and Moon compared

23 Phases of the Moon

24 Eclipses of the Moon A lunar eclipse occurs when the Moon passes into the shadow of the Earth. The lunar eclipse is visible to everyone on the night side of the Earth. Aristotle ( B.C.) used the apparent shape of the Earth’s shadow to show that the Earth is a sphere.

25 Lunar Eclipse

26 Lunar Eclipse

27 Lunar Eclipse Showing Earth’s Shadow

28 Lunar eclipses:

29 Spacecraft (satellites)
International Space Station

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