From the Greenwich Nautical Almanac, as corrected from the Greenwich observations:

Commencement and middle of eclipse before sunrise, end of the eclipse was observed as follows:

Mädler, with the great refractor .

Clausen, with a five foot telescope

20h 01m 19.1s sidereal time.

20.6
21.9

Lais, with a two foot telescope

Strong undulations of the sun's limb, at 50 altitude, caused a perceptible uncertainty. [M.] Giving the weights 3, 2, 1, to the above observed times, the adopted sidereal time at Dorpat is 20h 01m 20s.1.

Reduction of the observation of the commencement of the eclipse at Van Rensselaer :

Horizontal par. Cat Van Rensselaer 56′ 58′′.12

8".48 15' 50".3

Reduction of the observations of the end of the eclipse at Van Rensselaer :—

Horizontal par. Cat Van Rensselaer-56′ 55′′.62

We have, therefore, the following expressions for the time of true conjunction in—

Neglecting the smaller terms dr and dR, we find, from the Dorpat observations, dB = - 15".3; and substituting this value in the two preceding equations, we obtain the longitude of Van Rensselaer harbor

Recapitulation of results for longitude of Van Rensselaer Harbor by occultations of planets and a

The approximate longitude adopted by Mr. Sonntag, as given in the Narrative, page 398, Appendix No. IX, vol. II, is 4h 42m 403, or 70° 40′ 00′′; in my reduction of the magnetic observations of the expedition, this approximate result was retained, it should therefore be increased by 515, or 12′ 45′′; in my reduction of the meteorological observations, I have adopted a value resulting from a preliminary reduction of the moon culminations, viz.: 4h 43m 32s, or 70° 53′.

If we compare any of the separate results for longitude with the final value, and, in considering the probable errors, it should be remembered that one degree of longitude in the parallel (78° 37′) of Van Rensselaer is but 11.88 nautical miles, thus the above uncertainty of 75, in the final result for longitude, is but half a mile of linear measure.

The following pages contain the record and reduction of some astronomical observations obtained on the coast of Greenland by the expedition, in 1853, when on the way to Van Rensselaer Harbor. The names of these stations are as follows:

Fiskernaes, June 30, 1853. Station, flagstaff near the Governor's house.
Observations with the sextant of the sun's altitude near the meridian, for latitude.

Index error of sextant -7′ 55′′. Temperature 45° F. Aneroid barometer 30.10 inches.

Fiskernaes, July 1, 1853. Station on small island on the northern side of the harbor.
Observations of double altitudes of the sun with the sextant, for latitude.

Chronometer error

Mean time of observation

Apparent time

8 50

Index error of sextant -8' 45'. Temperature about 43° F. Aneroid barometer 30.05 inches.

O's apparent altitude

A

Chronometer time

Latitude

(This result is only approximate.)

Index error of sextant -3' 0". Approximate temp. 40° F. Approximate bar. 29.5 inches. Approximate longitude 55° 25′ W. of Greenwich.

The longitude is probably greater than the above value, assumed 3h 42m 30s or 55° 37'.5.

? Probably 90° 12' 35'.