Længde for Christiania, 0' 42'" 53.* 8, ligge 0' 45 m 59.*7 

 E. Greenwich, det er 6.*5 vestligere, end min astronomiske 

 Bestemmelse «iver. Nogén Grund til denne betydelige 

 Forskjel formaar jeg ikke at angive. 



for that place, viz. 0* 42 1 " 53. s 8. He 0* 45'" 59. s 7 E. 

 Greenwich, that is. ii.'."i farther west than detetmined by 

 my astronomical observations. Any reason for so consider- 

 able a differenee I am unable to suggest. 



4. Bodø. 



Samtidig med at Capt. Wille gjorde magnetiske Ob- 

 servationer, tog jeg den 13de August 1877 en Række Sol- 

 hojder paa et Sted nogle hundrede Skridt østenfor den 

 østligste Landgangsbrygge. En Del af Hojderne vare corre- 

 sponderende, en Række var Circummeridianhøjder, og senere 

 om Ettermiddagen toges, med lav Solstand, en kort Række 

 absolute Højder. Til de fleste Observationer benyttede jeg 

 Chronometer Frodsham, men til nogle af Circummeridian- 

 hojderne mit Duplexuhr, hvis Angivelser, efter samtidige 

 Sammenligninger, umiddelbart reduceredes til Frodsham. 

 Dette Chronometer sammenlignede jeg med Normalchrono- 

 metret Reid Morgen og Aften. 



Frodsham 19' 54'» 30.*0 7'' 0™ 30.*0 



Reid is 50 46. 5 5 56 44. 25 



Fr. Gorr. t. Reid — 1 3 43. 5 — 1 3 45. 75 

 Sextantens Endexfejl fandtes: 

 For Middag + 1.' 58."1 + l."8 4 Observationer. 



Efter Middag , -f 1 50. 3 ± 5. 2 4 — 



Om Aftenen + 1 63. 5 + 1. 7 4 



Højdeme ere beregnede med en Indexfejl af -f- 1' 

 57. "3 indtil Frodsham 12'- 10'" 55* og de følgende med 

 4- 1' 59."5. 



Efter de ombord gjorte meteorologiske Iagttagelser 

 var 

 Kl. 8 a. m. Barometer 770.""" 2. Temperatur 21.°0 C. 

 ,. 2 p. m. 69. 8. 21. 



.. 8 p. m. 69. 3.. 16. 



Efter en foreløbig Beregning fandt jeg som approxi- 

 mative Værdier ai' Bredden og Længden cpo — 67° 17' 10" 

 og Å = 0* 57™ 39.*6'. Kaldes den af disse Værdier for 

 hvert Observationsojeblik beregnede Højde af Solens Cen- 

 truni //„. tien af Observationerne, rettede for Indexfejl. Re- 

 fraction, Parallaxe og Solradius, fundne Højde li. den sand- 

 synligste Værdi af Bredden og Længden </„ -4- J cp og X 

 + l>. saa giver hver Observation en Ligning af Formen 



- cos a J (f — cos (f sin a Jl — h — //,, 



hvor a er Azimuth. Af samtlige Ligninger udlededes ved de 

 mindste Kvadraters Methode de sandsynligste Værdier af 

 1 (j og IX. Denne sidste Beregning er udført a f Besty- 

 reren af Bergens Observatorium, Hr. Astrand, der eiter 

 min Anmodning velvillig paatog sig dette Arbejde. 



Grupperes Differentserne mellem de observerede og 

 de efter de fundne sandsynligste Værdier for Bredden og 



4. Bodø. 



Whilst Capt. Wille was engaged in making magnetical 

 observations. I took on the 13th of August. 1877. a series 

 of solar altitudes, from a point a few huådred paces east 

 of the most easterly landing-pier. Part of them were equal 

 altitudes. part (one series) circum-meridian altitudes. and later in 

 the afternobn I took a short series of absolute altitudes. For 

 most of the observations I used the Frodsham chronometer : 

 but for some of the circum-meridian altitudes. my duplex 

 watch, its indications. however, having been immediately 

 compared with. and reduced to. those of the Frodsham. 

 This chronometer I myself compared morning and. evening 

 with the Reid. our chief timekeeper. 



Frodsham 19' 54'" 30.*0 7* <)'" 30.*0 



Reid 18 50 46. 5 5 56 44. 25 



Fr. Corr. to Reid — 1* 3 43. 5 — 1 . 3 45. 75 

 The index-error of the sextant was found to be — 

 Before ]S"oon -4- 1' 58.' 1 + l."8 4 Observations. 

 After Noon + 1 50. 3 + 5. 2 4 



In the Evening + 1 63. 5+1. 7 4 



The altitudes have beeh computed with an index-error 

 of + 1' 57. "3 up to 12' 10™ 55'' Frodsham, and the re- 

 mainder with an error of -f- 1' 59. "5. 



The results of the meteorological observations takeh 

 on boardj were as follows: — 



8 a. m. Barometer 77U."""2. Temperature 21.°0 C. 

 2 ]i. ni. 69. 8. 21. 



8 p. m. — 69. 3. 16. 



As åpproximate values for latitude and longitude, a 

 preliminary computation gave <[ „ = 67° 17' 10" and A 

 = 0' 57'" 39/6. Now. if the altitude of the sun's centre, 

 computed for each moment of observation from these valnes. 

 be called h a , the altitude found from the observations, after 

 correction for the index-error, refraction, parallax, and the 

 sun's semidiameter, h, the probable v;Uue of the latitude 

 and longitude. <f „ -4- J </ and /".„ - IL. — then each 

 observation will give an equation of the following form — 



— cos a 1 1\ cos (f sin a 1 L = h — //. 



in which a -signifies the azimuth. From all the equations 

 were found. by the method of the Least squares, the most 

 probable \ alnes of J tf and //.. This computation was 

 made by Mr. Astrand. Director of the Bergen Obser- 

 vatory, who at my request kindly undertook the work. 



On grouping the differences bétween the observed 

 altitudes and the altitudes computed from the most pro- 



