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Physics 202: Introduction to Astronomy – Lecture 2
Carsten Denker
Physics DepartmentCenter for Solar–Terrestrial
Research
January 20, 2006 Center for Solar-Terrestrial Research
Prologue Constellations Celestial sphere North and south
celestial poles Celestial equator Celestial coordinates Declination and
right ascension Solar and sidereal
day
Ecliptic Zodiac Seasons Summer and winter
solstice Vernal and
autumnal equinox Tropical and
sidereal year Precession
January 20, 2006 Center for Solar-Terrestrial Research
Constellations in the Sky
January 20, 2006 Center for Solar-Terrestrial Research
Celestial Coordinates
January 20, 2006 Center for Solar-Terrestrial Research
Solar and Sidereal Day
January 20, 2006 Center for Solar-Terrestrial Research
Long-Term Changes ‒ Precession
January 20, 2006 Center for Solar-Terrestrial Research
Group ProblemHow and why does a day measured
by the Sun differ from a day measured by the stars?
Assume that the Earth would orbit the Sun in the opposite direction. How would that affect the solar and sidereal day?
January 20, 2006 Center for Solar-Terrestrial Research
The Orbit of the MoonPhasesNew, quarter, and full MoonSidereal month (27.3 days) and
synodic month (29.5 days)Solar and lunar eclipsesTotal, annular and partial solar
eclipseUmbra and penumbra
January 20, 2006 Center for Solar-Terrestrial Research
Lunar Phases
January 20, 2006 Center for Solar-Terrestrial Research
Lunar Eclipse
January 20, 2006 Center for Solar-Terrestrial Research
Solar Eclipse
January 20, 2006 Center for Solar-Terrestrial Research
Group ProblemWhy aren’t there lunar and solar
eclipses every month