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Class Notes for Astronomy at University of North Carolina - Chapel Hill

ASTR 101 Lecture Notes - Lecture 4: Minute And Second Of Arc, Star Catalogue, Astronomia Nova

Galileo Galilei (1564-1642) o First modern scientist, in the sense that he pioneered the scientific method o Four Revolutionary Discoveries (1609) Moon not perfectly smooth. Contradict...

Astronomy
ASTR 101
Reichart Dan
ASTR 101 Lecture Notes - Lecture 3: Tropical Year, Correlation Does Not Imply Causation, Almagest

Basic Geocentric Model Earth: center of the universe, does not rotate Stars: fixed to the celestial sphere, celestial sphere revolves around earth east to west once every sidereal day Sun: fixed to a ...

Astronomy
ASTR 101
Reichart Dan
ASTR 101 Lecture Notes - Lecture 2: Angular Diameter, Eclipse Season, Umbral Calculus

Lunar Worth: Sidereal month 27.3 days o Tidal lock, moon rates 36o degrees every 27.3 days, we see the same side of the moon o Moon s phase cycle takes longer to repeat because the EarthMoon system revolves around the sun ...

Astronomy
ASTR 101
Reichart Dan
ASTR 101 Lecture Notes - Lecture 1: Winter Solstice, Solar Time, Equinox

Astronomical scales are very hard to grasp Sun is 93 million miles away from the Earth o Galaxies: scale is way larger (100,000 light years, or 1000 quadrillion kilometers). What is a light year? The distance light takes t...

Astronomy
ASTR 101
Reichart Dan
ASTR 101 Lecture Notes - Lecture 33: Kuiper Belt, Planet Nine, Double Planet

Pluto, Triton, and Planet Nine · Orbit of short period comets are highly elliptical, prograde, and incline o Look a lot like the Kuiper Belt Objects, but more elliptical · Triton ...

Astronomy
ASTR 101
Gregory Sloan
ASTR 101 Lecture Notes - Lecture 34: Star Formation

o The Formation of the Solar System • Three Models ▪ Capture Hypothesis • Planets caught gravitationally by the sun after all were formed • Doesn't work bc pla...

Astronomy
ASTR 101
Gregory Sloan
ASTR 101 Lecture Notes - Lecture 27: Asteroid Belt

• The Outer Solar System o Asteroids 10/28 • Overview ▪ Bode-Titius Relation • Start with the progression N=0,3,6,12,24,48… ...

Astronomy
ASTR 101
Gregory Sloan
ASTR 101 Lecture 8: Lunar Phases

Lunar PhasesDirection of illuminationCrescent points to where the sun isVen

Astronomy
ASTR 101
Daniel Reichart
ASTR 101 Lecture 7: Precession

PrecessionEarth precedes clockwise1 spin is half a day1 precession is 126,000 a yearFor an object to precede it have to haveNonspherical mass distributionCloser to spherical, it will have a slower precessionTop must be non...

Astronomy
ASTR 101
Daniel Reichart
ASTR 101 Lecture Notes - Lecture 6: Antarctic Circle, Equinox

SeasonsIt is hotter in the summer and colder in the winter because if earths tiltDirectness of illuminationHorizon angle of the sun at middayHow high the sun is in the dayIndirect illumination is when you could see the sha...

Astronomy
ASTR 101
Daniel Reichart
ASTR 101 Lecture Notes - Lecture 5: Sidereal Time, Solar Time, Tropical Year

Astronomical TimeSolar Time 1 solar day = 24 solar hoursEarth revolves 360 degrees around the sun every 365.24 solar days.Called a tropical yearMeridian is a giant line that comes from north to zenith to the southSun wont ...

Astronomy
ASTR 101
Daniel Reichart
ASTR 101 Lecture Notes - Lecture 4: Celestial Pole, Coriolis Force

Motion of Celestial SphereCoriolis force pushes us to the west, while gravity pushes us downCoriolis force is very weakEarth is moving west to east (counterclockwise when viewed from the top down), while the celestial sphe...

Astronomy
ASTR 101
Daniel Reichart
ASTR 101 Lecture 3: Constellations and Celestial Sphere

Constellations and Celestial SphereStars were used for navigation in the older daysLongitude and latitudeIn the sky, it is called right ascension (0 to 360 degrees; 024 hours) and declination (90 to 90 degrees)For latitude...

Astronomy
ASTR 101
Daniel Reichart
ASTR 101 Lecture 2: Size and Scale

Size and ScaleEarth is 15,000 km wide while the sun is 1,500,000 km wideLive stars can be as small as 110 of the sun, but can be as large as 1000x of the sunSun will eventually become a white dwarf, which is about the size...

Astronomy
ASTR 101
Daniel Reichart

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