Astronomy 1021 Lecture Notes - Lecture 4: Scientific Revolution, Earth Radius, Deferent And Epicycle
3 Oct 2018
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Earth"s atmosphere scatters the light (same reason why sunsets are red) If you were on the moon, it would be like seeing all the sunsets. Only see total solar eclipse if you are in the umbra. Umbral line is called path of totality . When moon is completely over the sun. Totality is the only time it"s safe to look at the sun. Bailey"s beads or diamond ring effect (red dots from sun"s atmosphere coming through) Could use pinhole camera or solar glasses at other times. Orbits not perfectly circular (moon"s around earth and earth"s around sun) Apparent sizes are different, sometimes moon is closer or farther(e. g. , super moon) A very small moon compared to sun leads to annular (and hybrid) solar eclipses. Alignment needed: the three celestial bodies and the orbital planes. The moon"s orbital plane is slightly tilted from the earth, so the shadows are not always aligned.
