How much time does it take for earth to a) make 1/2 of a revolution about the sun? and b) one rotation on its axis? (do not calculate anything: your answers are related to the astronomical basis for our calendar.) 5. september 23, 2019 will be one of the four special days of the astronomical calendar related to seasons. on th date, at what latitude on earth is the sun located at the zenith at noon? give your answer both in degrees as w as the special name given to this earthly latitude. (do not name a location on the celestial sphere! ) info: we locate objects in the sky by their altitude (height above horizon measured in degrees) and azimuth (compass direction). on earth, we locate places using latitude and longitude in degrees. on the celestial sphere, use declination to measure north/south coordinates relative to the celestial equator. any astronomical object's maximum height occurs when the object is crossing the meridian and is calculated using 90° - your latitude + declination (all are in degrees) this equation will tell you how high from the southern horizon an object will be found. if your answer is greater tha 90 degrees then the object is not in the south at all but in the opposite direction. if your answer is a negative number, then the object is below the horizon and can't be seen. 6. chicago is located at a latitude 42 degrees n of the equator. what is the altitude of the north star as seen from this location? show your calculation for credit. (use declination = +90° for n. star) note: this star's position does not change over the course of a day or year since it is almost directly above the rotational axis of our planet 7. alpha crucis is located at -63° (minus 63°) degrees declination. can you see this magnitude 1 star from san antonio? show your calculation for credit. san antonio's latitude is 29.5 degrees n. 8. how high is the sun at astronomical noon in san antonio on september 23? in which direction should you look to see the sun at astronomical noon (not human time) in san antonio? the sun's declination changes daily, but repeats yearly, and is always 0° on this date. show your calculation for credit