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DEPARTURES.
gitude
484
....
...
4. Difference of Longitude and Corresponding De-
7. For finding the Distance of an Object, by Two
Bearings and the Distance run between them 500
8. True Depression or Distance of the Sea Horizon 501
9. Number of Feet subtending an Angle of l' at Different Distances...
10. Maritime Positions ..
.. 501
502
601
REDUCTION
OF THE
ELEMENTS
IN THE
NAUTICAL
ALMANAC.
18. For converting Time into Arc....
19. Correction of the Sun's Declination, at Sea..... 602
20. Correction of the Equation of Time, at Sea..... 602
21. For reducing Daily and Twelve-hourly Variations 603
21A. Logarithms for reducing Daily Variations ... 609
22. For reducing the Moon's Declination
611
613
25. For finding the Equation of Second Differences.. 614
TIMES
OF
CERTAIN
PHENOMENA.
TABLE
PAGE
26. Apparent Time of the Sun's Rising and Setting.. 615
27. Approximate Apparent Times of the Meridian
Passages of the principal Fixed Stars ... 618
27A. Correction of the Times in Table 27
.... 619
28. Correction of the Time of the Moon's Meridian
Passage
29. Hour-angle and Altitude of a Body upon the Prime
Vertical
619
620
30. Apparent Dip of the Sea Horizon
625
31. Mean Astronomical Refraction
32. Correction of the Mean Refraction for the Height
of the Thermometer
626
33. Correction of the Mean Refraction for the Height
of the Barometer
627
34. The Sun's Parallax in Altitude, and Semidiameter 627
35. Dip of the Shore Horizon
36. Corresponding Thermometers
628
37. Corresponding French and English Measures... 628
38. Corrections of Altitude of the Sun and Stars.... 629
ALTITUDE. 39. Correction of the Moon's apparent Altitude ..... 630
40. Corresponding Horizontal Parallax and Semidia-
41. Correction of the Moon's Equatorial Parallax for
the Figure of the Earth
42. Augmentation of the Moon's Semidiameter... 639
43. Correction for reducing the true Altitude of the
Sun or a Star to the apparent Altitude...... 640
44. Correction for reducing the true Altitude of the
Moon to the apparent Altitude ....