NATS1745.WED.MARCH8.docx

# NATS1745.WED.MARCH8.docx - NATS 1745 WED MARCH 8/2017...

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NATS 1745 WED, MARCH 8/2017 ASSIGNMENT: Based on position of sun in sky you get the time At 45 degrees RISE OF MOON: You have to move the little guy until moon (grey ball) is at the green circle at the horizon **** Around 9am - waxing crescent At 45 degrees SET OF MOON: move it until the moon is below norizon = 9:40pm waxing screscent At 45.5 degrees At 126 degree angle moon rises at 9pm moon sets at 9:50am waning gibbous have to match which phase matches to which case in the diagram you need a guy standing on horizon and draw horizon and east to west and zenith LECTURE: optical telescope hans lippershey give credit to him Zacharias janssen couldl be him too Jacob metius could be him too BUT ALL of these created telescopes with refracting systems -didn’t use it to study sky -used it to SPY -SOLD it to the pirates - first person to use it for astronomy was GALILEO 1600-1700 ad: Galileo discovered laws of falling objects (doesn’t matter how heavy object is, it drops at same law = 1 st newton law)

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o So 1 st newton law was not discovered by newton, but by galileo Johanes Kepler publishes a book and discovers that intensity of light varies inversely with the square of the distance from the source o he wasn’t the first one to discover that o 965-1039 IBN AL-HAYTHAM ALHAZEN discovered that when he said light does not come from retina like greeks thought o knowledge is not coming out of nothing o kepler says that if you have a light at a point (lightbulb) and it is shining, if you are at a distance POINT B and you double the distance to POINT C, you receive ¼ radiation not ½ o so if you DOUBLE distance, radiation is only ¼ not ½ (so therefore, it is Inversely RELATED) o so it is proportional to squre of radius or that sphere o so that sphere has an rea which is the square of radius o so as you increase radius, you use same number of photons, but you spread the area o so receive less by INVERSE of square 1608: o in the netherland o application for PATENT from HANS LIPPERSHEY to make SPY GLASSES o patent was rejected because they said it was not new o later on people made it and sell it 1609: o Galileo creates his own telescope (he is NOT the inventor but he hears about the invention and makes his own o Same year JOHANNES KEPLER he explains the first two laws of planetary motion and accurately describes the orbit of Mars Law#1: Planets orbit in elipses Law#2:Closer we are to sun the faster they move in that orbit Law#3: he discovers later 10 years later 1610: o Galileo discovers mountains and craters on moon o Looks at moons of Jupiter o He discovered that they are NOT orbiting arounf the earth so he discovered that these 4 moons are orbiting around Jupiter o He also looked at milky way galazy and discovered a lot of stars so what was seen as a huge cloud of gas was actually a star in the sky o
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• Fall '11
• RobinMetcalfe

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