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592 PHIPPS’S JOURNALs
<¢ Fx ampie L—Jutie the twenty-firft, the altitude of the fun’s center was obferved
to be 46° 6’ at 16! 45” after apparent noon ; the latitude by account was 67° 17’; the
fun’s declination being then 23° 28’ N., the fuppofed meridian altitude 46° 11’.
Se
«* Suppofed latitude 67° 17’ Co. Ar. Cof.0,41322. — Rifing 16’ 45” = = = 2442643
Sun’s declination 23 28 Co. Ar. Cof. 0,03749. — Suppofed Mer. Alt. Ar. Co. Cof, = 0515967
: 7,58610
Log. ratio 0,45041 - = “ = 0,450
The change in altitude is +0° 5’ = « - - Sine 7,13539
Obferved altitude 46 6
Meridian altitude 46 11
Declination 23 28
Altitude of the Equator 22 43
Latitude 67 17 N.
<< As the altitudes for determining how much the watch differs from apparent time
were taken near the prime vertical, a great error in the fuppofed latitude will make a
very infenfible change in the apparent time; nor will it create any great difference in
the variation of altitude near noon in a given time, as will appear by the following
computation : ;
<«* Suppofe the latitude by account was 68° 17’, a degree greater than before.
: By
« Suppofed latitude 68° 17’ Cof. Co. Ar.0,43178 Rifing 16’ 45” - - = 2542643
Declination = 23 28 —— 0,03749 Suppofed Mer, Alt. 45. 11. Cof. Co. Ar, O,151Qr
, 7957834
Log. ratio 0,46927 - “ - - 0,46927
The change in the fun’s altitude is 0° 4’ 25” - ~ » Sine 7,10907
- Obferved altitude 46 6
Meridian altitude 46 10 25
Declination 23 28
Altitude of the Equator 22 42 25
Latitude 67 17 35 which only differs thirty-five feconds from
the true latitude we found before.
«¢ Examp_e IJ.—June the twentieth, the altitude of the fun’s center was obferved
o° 28’ 38” after midnight, to be 1° 13’, the latitude by account being 67° 40’ N.
; ie
«© Suppofed latitude 67° 40’ Cof.Co. Ar. 0,42022 Rifing 28’ 38” = - = —2,89380
Declination - 23 28 —~——— 0,03749 Suppofed Mer. Alt. 1° 8° Cof, Co. - 0,00001
789381
Log. ratio 0,45771 a Ps . . 045771
Change in the altitude —o° 9! . ay Sine 7,43610
Obferved altitude 1 13
Meridian altitude 1
Co-declination 66 32
Latitude 67 36 N.
* There
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