Register to reply 
Finding the time the sun sets 
Share this thread: 
#1
Sep1113, 07:10 AM

P: 2

Hi everyone, new member here. Anyway, for my astronomy class my professor wants us to calculate the zone time the center of the sun sets on the winter solstice, at 40 degrees north latitude, and I'm a bit stuck. I know on the winter solstice, the declination of the sun is 23.5 degrees and the right ascension is 18h, and since it would be setting the altitude would be zero. I figured out that I need to find the hour angle of the sun at that exact moment, and use this as the local apparent solar time, and correct to make it mean solar time. I think the objective is to use spherical trigonometry and set up a triangle in the sky, but I'm at a loss of how to set it up, so if anyone could give me a few pointers, that would be great. Thanks.



#2
Sep1113, 08:22 PM

Sci Advisor
PF Gold
P: 1,381

You want to find this book somewhere:
http://www.amazon.com/AstronomicalA.../dp/0943396352 Sounds like your prof is going to have you doing lots of these kinds of things. This book gives hand calculation methods (you can use a calculator or write simple code, too) 


Register to reply 
Related Discussions  
Finding X and Y with respect to third variable if having two sets of X and Y  General Math  1  
Finding topologies of sets in complex space  Calculus & Beyond Homework  4  
Prove 2 sets are equivalent by finding a onetoone and onto function between them.  Calculus & Beyond Homework  1  
Finding unions of sets  Precalculus Mathematics Homework  3  
Finding sets, listing sets (discrete math)  Calculus & Beyond Homework  2 