ASTR 101 Lecture Notes - Lecture 10: Heel Stone, Retrograde And Prograde Motion, Egyptian Pyramids
3 Oct 2016
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Inferior: closer to the sun than we are (mercury, venus); never be seen overhead at midnight. Superior: farther out (mars, jupiter, saturn, uranus, neptune); can be seen overhead at midnight; never pass between us and the sun. Transits: inferior planets cross the sun, seen as small black silhouette; rare due to tilt of orbits. Moon drifts around us across background eld of stars. Retrograde motion: steadily drift across and comes to a halt, then moves backwards for a time, and eventually stops again and goes back the other way; swivels back and forth like a loop. Stone hedge is special because the stones are shaped. Brought in from a far place; large ones come from north of it"s current position, small from close to wales. Stone hedge is larger than the obvious stones; more around the eld. Astronomical connection; heel stone points directly at the sun on midsummer"s day sunrise.
