266 OBSERVATIONS OF THE ECLIPSE 



On the 10th of June I arrived at Kinderhook south landing, 

 the place where it was intended to observe the eclipse. By 

 observations of meridian altitudes of the sun and stars, the la- 

 titude of the place was ascertained as follows. 



O t II 



June 12th. By double altitudes Inverse and direct of ursa minor. . 42 23 11 



12th. ditto. . . ditto. . Antares. . 42 23 18 



loth. By one meridian altitude of 0, direct observation. . 42 22 54 



13th. ditto. . . . ursa minor. . . 42 23 00 



14th. By double altitudes direct and inverse, 50' of time 7 .n no «■-» 

 before and after the meridian. ... 3 ° 



Mean latitude. 42 23 03 



Rate of going of the chronometer according to mean time., 

 by corresponding altitudes of the sun. 



June 11th. Chronometer too slow. . . = 12 09 9" 



12th. 12 08 4 i 



14th 12 06 2 >dailvgain. =1" 18 



15th. 12 05 



16th 12 04 0. 



11 



I >d 

 iJ 



Observation of the eclipse, 16th of June, 1806, with the 

 achromatic telescope, 2 x yL. English inches aperture, triple ob- 

 j ect glass No. 1, was used which magnifies 90 times. 



9 h 37' 33", (chronometer.) Beginning 45° from the left in- 

 ferior vertex, in the very point on which the eye 

 was fixed, the impression was so slight, that 4" elapsed before 

 it was certain that it had commenced. 



10 h 55' 58", (chron.) First interior contact or total obscurity, 

 certain to half a second, 50° from the right su- 

 perior vertex : 4" or 5" before the total obscurity, the remainder 

 of the disk of the sun was reduced to a very short line, interrupt- 

 ed in many parts. — The darkened glass with which this pheno- 

 menon had been observed, was sufficiently clear to distinguish 

 terrestrial objects. After this observation I laid aside die coloured 

 glass, to observe the end of total darkness. I examined the moon 

 during two minutes, without observing one luminous point in her 

 disk. The disk had round it a ring or illuminated atmosphere, 

 which was of a pearl colour, and projected 6' from the limb, the 

 diameter of the ring was estimated at 45'. The darkness was 

 not so great as was expected, and without doubt the light was 

 greater than that of the full moon. From the extremity of the 

 ring, many luminous rays were projected to more than 3 de- 



