1882.] 223 [Hagen. 



Tarqui 30 4' 30". 83 -f 1".87 



Cotchesqui 2 37.83 — 1.87 



Trivandeporum 11 44 52.59 — 0.58 



Paudree 13 19 49.03 + 0.57 



Punnaj 8 9 38.39 — 1.78 



Putcliapolliam 10 59 48.93 ~ 1.22 



Dodagoontah 12 59 59.91 + 3.54 



Namtliabad 15 6 0.64 — 0.54 



Formetera 38 39 56.11-1-8.40 



Montjony 41 21 45.45 + 2.55 



Barcelona 41 22 47.16 -f 0.82 



Perpignan 42 41 58.01 — 4.16 



Carcassone 43 13 54.31 — 1.03 



Evaux 46 10 43.19 — 5.88 



Pantheon 48 50 48.94 + 0.37 



Diinkirchea 51 2 8.74 + 3.93 



Gottingen 51 31 47.85 — 2.76 



Altona, 53 33 45.27 -f 2.76 



Dunnose 50 37 8.21 — 1.86 



Greenwich 51 28 40.00 +0.94 



Blenheim 51 50 27.09 + 3.01 



Arburyhill 52 13 28.19 + 1.83 



Clifton 53 27 31.99 — 3.91 



Mallorn 65 31 31.06 + 1.31 



Pahtawara 67 8 51.41 — 1.31 



In like manner also mensurations of Parallels might serve to find the 

 errors in longitude. Amongst tiie parallactic phenomena, which may con- 

 tribute towards finding the errors in longitude and latitude, especially 

 solar eclipses and occultations of stars are to be mentioned. If in the 

 equation, which represents the condition of a certain place of the earth 

 lying in the surf\ice of the cone of shadow, not only the longitude, but 

 also the latitude and sidereal time, are supposed to be erroneous,* very 

 likely part of the errors, for which formerly the ephemerides were made 

 responsible, must be ascribed to the inclination of the apparent horizon. 

 Thus longitude and latitude of an Observatory being approximately cor- 

 rected by any of these methods, the formulas given in the preceding pages 

 will furnish the means of finding the constants of correction for the instru- 

 ments, and finally also the inclmation of the apparent to the true horizon as 

 to magnitude and direction. 



*BrUiinow in his " Lelirbuch der Spharischeii Astrour»mie,"' p. 32), dsvelops 

 this equation, supposing only tlie Kphemerides to he erroneous, Chanvenet in 

 his " Manual of Spherical and Practical Astronomy," 5th ed. vol. i, p. 523, re- 

 gards the corrections of the coordinates of the place of observ^aliou as depend- 

 ing only upon the correction of the eccentrictity of the terrestrial meridian, 

 supposing the latitude itself as well as the sidereal time to be correct. 



