Astronomy 1021 Lecture Notes - Lecture 4: Apparent Retrograde Motion, Corona, Proper Motion

• School: Western University
• Department: Astronomy
• Course: Astronomy 1021
• Professor: Robert Cockcroft

Document Summary

Lunar: sun , earth moon, dark red or brown colour, total lunar eclipse the moon turns red, the earths atmosphere scatters light. If you were on the moon it would be like seeing all the sunset. Apparent sizes of the sun ands moon: orbits not perfectly circular, apparent sizes are different, leads to annular and hybrid solar eclipses. Why don"t we get a lunar eclipse every full moon: tilt is 5 degrees so it does not orbit straight around. Apparent retrograde motion (looks like its going backwards) Causes the ncp to move in a 26,000 year cycle. Most stars won"t appear to move into our lifetime. The star with the largest proper motion is barnard"s star. Britney dortona: 10. 3 arch seconds per year, magnitude 9. 54 (too faint to see w out a telescope. Dark ages: a lot of progress was actually made in places other than europe. Longest day of the year, sun at zenith, no shadow.