ASTRONOMICAL PAPERS 



2 55 



EQUATION of EQUAL ALTITUDHS of the SUN, for the Latitude of Pun. 

 '^ Calculated by JOHN EWING. 



^^ , ^ , Half the Interval of the Obfcrvatlon^ in tinic. 



Months 1 Sun s 



ADELPUIA 





a II d 

 Days. 



Longi- 

 tude. 



3h. 30'. Uh. o'. 4h. 30'. 

 + ' + I + 



iV 



^. 



(Uiohi 



i). s. 

 23, 6. 



o. 



// 



//; // 



op 3 

 5T3 



33, 7 

 a8, 





/" ,7 



6;i3. 5'7 



33^3- 53 



5614- 

 1214. 



21 14. 

 25114- ^^14. 33114- 



25 T4 



777"^ 



10 



f3- 

 14. 



13 



27 



20 14 



t3- 

 14- 

 14. 



14. 



34^4- 52 

 4^ 



53 M- 

 18 14. 



3<'>i5 



47 f5 



IT. 



26 t5. 

 4815. 



315- 



T2 tj. 

 1415- 



8r5- 



7;x5. 



26^16. 



38,16, 20' 1 7. 



44!! 6. 21 17. 



4i|i6. 16 t6. 



o 14. ■ 14 



10.13. 32 



151^2- 5-1 

 20; 1 2. s 



2 s' T I . i; 



14. 



14. 



13. 



13. 



12. 



TT. 



6 



37 

 c 



10 

 'I 



30,14. 



14. 



13- 

 ^3- 



12. 



rr. 



5415. 



3l'i4. 



46113. 5814. 



i5;i4 



513- 



Ij 12. 

 T4TT. 



15^3- 



21 12. 



3x5- 



4815. 



12 14- 



271^3- 



3t|l2. 



43 16. 12 



9:15. 36 



2; 14. 51 



tJI 9. 5.'- 



8. 



/ 



J 



3 



3,^ 



.5 

 27 



42 



9- 

 8. 



7. 

 5- 

 3 



5« xo. 

 37 B. 



27i 5- 



4^! 3 



I 10. 



18 IT. 24|TT. 



~~S~io. 8 " 



41 



32 



^3- 



12. 



57 

 54 



16. 

 16. 



15- 

 14. 



T ■^■ 

 1 '\" 



,ir. 43^1 



50 



17- 



39 



9 



16. 



31 



19 



15. 



55 



21 



14. 



50 



14 



1-3 • 



37 



c8 



12. 



16 



iL- 



3.8 8. 41 



7 7. 8 



5 r. 53^ I. 53! I- 5.1|_L\13 



28 

 43 



5 

 3 



28 



43 



8. 44 



7. 10 

 5. 29 



3- 43 



10. 

 8. 



7. 



5- 



3- 

 I. 



14 TO. 22 



47 8. 53 



1.2' 7- 17 



31 5- 34 



45 3- 45 



54 T. 54 



( 



^ ^oy^' ;;/^?//?or/ of deducing the true time of the S\J ^ s pqf 

 fiiig the meridian per clocky from a comparifonoffour equal 

 altitudes, ohfer^ed on two fucceeding days. By David. 

 RiTTENHOUSE,^. M. of Norritou. Commumcated Jug.^ 



lyth 1770J ^_y William Smith, D. D. 



y 



H E method of obtaining the true time of the Sun's 

 paffing the meridian, by correding the mean 7ioon^ 

 jduced from obfcrved equal altitudes of the Sun, by the 

 help of the tables of the equation of correjponding, altitudes y 

 being attended with fome trouble, and not being fo ready 

 as might be wiflved; perhaps the communication of the 

 following method, which I frequently make ufe of, may 

 be acceptable, as it is praaicable without any tables, and 

 will fave a good deal of labor, when the neceflary corre- 

 fponding altitudes can be obtained. 



Suppofc, then, there are four fetts of altitudes obtained 

 on two fucccffivedays, (viz, one fett in the morning, and 

 one in the afternoon each day) the inftrument being kept 

 cxaaiy at the lame height both days; then the exad time 

 of the Sun's paffing the meridian per clock, may be readily 

 obtained by the following — RULES. 



