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Cool! silly

“ Billions and billions of stars!” Star patterns in the sky are mere illusions, and transient.

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Not an “overhead projector”!!

2150 year ago, Greeks knew a lot . Size of the earth Approximate size of sun and moon Oh, and that the EARTH IS ROUND … and even though there are “ billions and billions of stars”, to us they really do just look like they’re spinning around on some outer sphere.

Size of the earth

Approximate size of sun and moon

Oh, and that the EARTH IS ROUND

After Copernicus Before Copernicus For naked eye, earth based observation, there is NO DIFFERENCE.

NOT TO SCALE !!!!!!!!!!

Astrolabe 1250 A.D. Planisphere 2009 A.D.

Stereographic Projection causes DISTORTION Planisphere offers no help Astrolabe has grid lines.

Make your astrolabe from a kit!

That’s a star!

Sunset

Naked Eye Astronomy Focuses on apparent motion of sun, stars, planets, moon Relevant every day of your life Likely the most tangible connection to all of humanity

Focuses on apparent motion of

sun, stars, planets, moon

Relevant every day of your life

Likely the most tangible connection to all of humanity

Astrolabes Adler Planetarium’s website deltronweb.com/astrolabes TWITTER: hcovitz

Adler Planetarium’s website

deltronweb.com/astrolabes

TWITTER: hcovitz