8 Lsengde for Christiania, O'1 2 * 42’" 53/8. ligge 0* 45,n 59/7 E. Greenwich, det er 6/5 vestligere. end min astronomiske Bestemmelse giver. Nogen Grund til denne betydelige Forskjel formaar jeg ikke at angive. for that place, viz. O4 * * 42™ 53/8, lie 0A 45’" 59/7 E. Greenwich, that is. 6/5 farther west than determined by my astronomical observations. Any reason for so consider- able a difference I am unable to suggest. 4. Bode. Samtidig med at Capt. Wille gjorde magnetiske Ob- servationer, tog jeg den 13de August 1877 en Rmkke Sol- bojder paa et Sted nogle bundrede Skridt ostenfor den ostligste Landgangsbrygge. En Gel af Hpjderne rare corre- sponderende, en Rsekke var Circummeridianbojder. og senere om Eftermiddagen toges. med lav Solstand, en kort Rsekke absolute Hojder. Til de tleste Observationer benyttede jeg Chronometer Frodsham, men til nogle af Circummeridian- bpjderne mit Duplexubr, bvis Angivelser, efter samtidige Sammenligniiiger, umiddelbart reduceredes til Frodsham. Dette Chronometer sammenlignede jeg med Normalchrono- metret Reid Morgen og Aften. Frodsham 19A 54’" 30/0 V' O’” 30/0 Reid 18 50 46. 5 5 56 44. 25 Fr. Corr. t. Reid — 1 3 43. 5 — 1 3 45. 75 Sextantens Indexfejl fandtes: For Middag + 1' 58." 1 + l."8 4 Observationer. Efter Middag 1 50. 3 + 5. 2 4 — Om Aftenen + 1 63. 5 + 1. 7 4 Hojderne ere beregnede med en Indexfejl af —(— 1' 57."3 indtil Frodsham 12'* 10’“ 55s og de folgende med -f 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. 0 „ 8 p. m. — 69. 3. — 16. 0 Efter en forelobig Beregning fandt jeg som approxi- mative Yairdier af Bredden ogLsengden ip0 = 67° 17' 10" og A0 — 0h 57”’ 39/6. Kaldes den af disse Yserdier for bvert Observationsojeblik beregnede Hojde af Solens Cen- trum /i0, den af Observationerne, rettede for Indexfejl. Re- fraction, Parallaxe og Sol-radius, fundne Hojde h, den sand- synligste Yserdi af Bredden og Lsengden r/>0 4- !(p og l0 + /X, saa giver liver Observation en Ligning af Formen — cos a J cp — cos cp sin a J X = h — li ,> hvor a er Azimuth. Af samtlige Ligninger udlededes ved de mindste Kvadraters Methode de sandsynligste Yserdier af J cp og J X. Denne sidste Beregning er udfort af Besty- I'eren af Bergens Observatorium. Hr. Astrand. der efter min Anmodning velvillig paatog sig dette Arbejde. Grupperes Differentserne mellem de observerede og de efter de fundne sandsynligste Yserdier for Bredden og 4. Bod0. 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 hundred paces east of the most. easterly landing-pier. Part of them were equal altitudes, part (one series) circum-meridian altitudes, and later in the afternoon 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 197‘ 54m 30/0 7* O’” 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 Noon 1' 58." 1 + l."8 4 Observations. After Noon -f 1 50, 3 + 5. 2 4 In the Evening -f 1 63; 5 + 1. 7 4 — The altitudes have been computed with an index-error of -j- C 57."3 up to L2;‘ 10“ 55" Frodsham, and the re- mainder with an error of -f- 1' 59."5. The results of the meteorological observations taken on board, were as follows; — 8 a. m. Barometer 770.mm2, Temperature 21.°0 C. 2 p. m. — 69. 8, — 21. 0 8 p. m. — 69. 3, — 16. 0 As approximate values for latitude and longitude, a preliminary computation gave cp0 = 67° 17' 10" and X» — O'1 57’“ 39/6. Now. if the altitude of the sun’s centre, computed for each moment of observation from these values, be called h0, the altitude found from the observations, after correction for the index-error, refraction, parallax, and the sun’s semidiameter, h, the probable value of the latitude and longitude, cp„ J <p and A0 + J X. — then each observation will give an equation of the following form —- — cos a J (p — cos cp sin a J X = h — h0 in which a signifies the azimuth. From all the equations were found, by the method of the least squares, the most probable values of J cp and J l. 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 between the observed altitudes and the altitudes computed from the most pro-

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