Phys 356: Astronomy Homework # 2 KEY 2 (5 points) a. Observing from Edwardsville, IL (Latitude 40° N), draw the Path of the Sun on the following Celestial globe for the following dates: the spring and fall equinoxes, the summer solstice and the winter solstice. (1 points for each of the Summer Solstice, Spring/ Fall Equinox, Winter Solstice. 1 points for today’s date.) Summer Solstice or 6/21 Spring/ Fall Equinox or 3/21 and 9/21
Today’s Date
Winter Solstice or 12/21 East North South
West
b. How did you determine the path of the Sun for these given dates? · Spring and Fall Equinox, o the Sun rises in the East, sets in the West o Crosses the meridian 90° - latitude above the Southern Horizon. o For Manhattan this is 51° above the Southern horizon. · In the Northern hemisphere on the summer solstice, o the Sun rises north of East, sets north of west. o Crosses the meridian 90°-latitude + 23.5° above the southern horizon. o For Manhattan, this is 74.5° above the southern horizon. · In the Northern hemisphere on the winter solstice, o the Sun rises south of East, sets south of west o Crosses the meridian 90°-latitude-23.5° above the southern horizon. o For Manhattan, this is 27.5° above the southern horizon. c. Draw the path of the Sun for today’s date. Use Table S1.1 to calculate the Sun’s right ascension and declination. (See above Sun’s declination is @ -18°.) 2 (5 points) a. Observing from Sydney, Australia (Latitude 34° S), draw the Path of the Sun on the following Celestial globe for the following dates: the spring and fall equinoxes, the summer solstice and the winter solstice. (1 points for each of the Summer Solstice, Spring/ Fall Equinox, Winter Solstice. 1 points for today’s date.)
Summer Today’s Solstice or Date 12/21 Spring/ Fall Equinox or 9/21 and 3/21
Winter Solstice or 6/21
East North South
West
b. How did you determine the path of the Sun for these given dates? · Spring and Fall Equinox: o the Sun rises in the East, sets in the West o Crosses the meridian 90° - latitude above the Northern Horizon. o For Sydney this is 56° above the Northern horizon. · In the Southern hemisphere on the summer solstice, o the Sun rises south of East, sets south of west. o Crosses the meridian 90°-latitude + 23.5° above the northern horizon. o For Sydney, this is 79.5° above the northern horizon. · In the Southern hemisphere on the winter solstice, o the Sun rises south of East, sets south of west o Crosses the meridian 90°-latitude-23.5° above the northern horizon. o For Sydney, this is 32.5° above the northern horizon. c. Draw the path of the Sun for today’s date. Use Table S1.1 to calculate the Sun’s right ascension and declination. (See above Sun’s declination is @ -18°.)