Chapter 3

 

We all are Scientists!

Concrete vs. Abstract

 

Early Astronomy

         Mostly calendars and timekeeping  [data patterns and recording]

         The Greeks develop geometry to help explain it all

                 Eratosthenes

 

The Geocentric Model    Ptolemy

 

What is happening?  Why is it happening?

         How do you distinguish what is scientifically correct?

                 Ockham 1288-1348  and his razor

         “Beyond all doubt”

 

Our changing idea of the solar system

 

Copernicus  1543 De Revolutionibus Orbium Caelestium

 

         Heliocentric theory  a simpler explanation of apparent retrograde motion.

 

Tycho Brahe

 

 

Kepler’s Three Laws  1610, 1618

 

         1 the orbit of each planet about the Sun is an ellipse with the Sun at one focus  a

 

         2 as a planet moves around its orbit, it sweeps out equal areas in equal times.

 

3 (orbital period in year)2  = (average distance in AU)3   p2 = a3       a

Galileo

         Venus phases

         Jovian moons

         Sunspots

         Lunar craters

 

Science, Pseudoscience, and Nonscience

         Testable [and  Has it been tested?  With what result?]

         Superstition and myth (eggs on the equinox)

 

Astrology

         Its relation to astronomy

        

 

Scientific Objectivity