SCI238 Lecture Notes - Lecture 2: Medicine Wheel, Calender, Lunar Eclipse
29 May 2020
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Document Summary
How far apart are objects in sky? measure angular separation to get true physical or linear separation. Usually objects are much closer to each other than to us thus we can assume that they are both @ same distance from us. O a d d for small > a ~ s a d x01rad. A = arc length (d from us), d = distance (radius of circular arc) 10160157. 3rad 0. 0029rad distance to moonis 400k km diameterof maria moon ~ 0. 5 deg across (30 arcmin) By eye largest maria is ~ 1/3 of moon"s diameter. Position of sun @ noon @ lat = 51deg. 1st day of spring (vernal equinox) > near. March 22 sun directly above equator (moving from n to s) Originally was in constellation aries after march (after 0deg), below equator till sept above equator then hits 0 at march.
