function [a,b]=sunangle(d,t,wei)
%æ¤å½æ°æ¯æ ¹æ®Cooperæ¹ç¨è®¡ç®å¤ªé³èµ¤çº¬è§ï¼å计ç®é«åº¦è§håæ¹ä½è§gama
% å
¶ä¸è¾å
¥åæ°d为å½å¹´ä¸èªæ¥åæ¥èµ·ç第d天
% t为å½æ¶çæ¶å» 24æ¶å¶
% wei为å½å°ç纬度ï¼è¾å
¥çæ¯è§åº¦ï¼ä¸æ¯å¼§åº¦
% è¾åºåæ°a为太é³æ¿å¹³é¢çåºå®ä¸å¿è½´å¨å°é¢ä¸çåç´æå½±å离å½å°çº¬çº¿çè§åº¦
% b为太é³æ¿å¹³é¢ä¸æ°´å¹³é¢ç夹è§ï¼è¾åºçæ¯è§åº¦ï¼ä¸æ¯å¼§åº¦
wei=wei*pi/180;
deta=23.45*sin(2*pi*d/365)/180*pi;%ç±Cooperæ¹ç¨æ±å¾å½å¤©èµ¤çº¬è§
w=(12-t)*15*pi/180;%w为å®ä¹ç太é³æ¶è§ï¼ä¸å为æ£ï¼ä¸å为è´
h=asin(sin(wei)*sin(deta)+cos(wei)*cos(deta)*cos(w));%太é³é«åº¦è§
r=acos((sin(h)*sin(wei)-sin(deta))/(cos(h)*cos(wei)));%太é³æ¹ä½è§
a=-r;
b=pi/2-h;
a=a*180/pi;
b=b*180/pi;
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¥>> [a,b]=sunangle(80,9,30)a = -91.1553
b = 40.6149
å说æå¨æ¥ååç第80天ï¼æå°çº¬åº¦ä¸º30度ï¼ä¸å9ç¹æ¶ï¼å¤ªé³æ¿åºæ¾ç½®çè§åº¦ä¸ºï¼å¤ªé³æ¿å¹³é¢ä¸å¿è½´å离西åå1.1553度ï¼å¤ªé³æ¿ä¸æ°´å¹³é¢çè§åº¦ä¸º40.6149è§ã
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