CORRECTION OF THE MEAN REFRACTION FOR THE height OF
THE BAROMETER

ALTITUDES

Bar.

sub.

4° 5° 54° 6° 61° | 7° | 73° 8° 9° 10° 12° 15° 20° 30° 40° 50° 70° 90°

37′′ 35′′ 33′′ 29′′ 27′′ 22′′| 18′′ 13"

28

Bar.

24 20 16

96

add

26

21 17 13

8" 5′′8 4′01′′8 | 0
8 5.5 38 17

25

20

17

25 22 19

15 II

28.0 46

40

37

28.1 44 38

35

333

421

53

34

32

31

6

12

5.3 3.7

7 51 3'51'5
7 4.8 3.3 15
7 4.6 3.2 14
644 30 13

4129 130
6 39 2.7 12 O
5 3.7 2.6 1.I
53°42'4 1'0
5 3 2 2 2 1.0

о

31.5

31.4

7

6

5

3 2.3 1.6 0.7

31.0

5

15 14

13 12

13 12

4

30.7

I

I

I

о

765++M210

2

976543NTO

19875+3= O

19876

20976

29.4 14 12 II IO

29.5 12 10

4208 753N O

975420

420

96 42O

II ΙΟ IO

IO

6

5

Jan. 1 16' 17' 87 86 8′27′′6 67 5'6 4 4 30 15 0" 16′ 15′′ Dec. 1
Feb. 1 16 15 8.7 8.6 8.2 7.6 6.65.6 43 30 15
Mar. 1 16 98.6 8.5 8.1 7.5 6 6 5 5 4 3 3 0 15 0 16 1 Oct. 1
Apr. 116
18.5 8.4 8.0 7 4 6 5 5 5 4 3 29 150 15 53 Sept. 1
May 115 53 8.4 8.3 8.0 7.3 6.5 5 4 4 2 2.9 150
15 47 Aug. 1

June 115 47 84 8.3 8.0 7.3 6.4 5 4 4 2 29 15

CORRECTIONS OF ALTITUDE OF THE SUN AND STARS,
(Involving Dip, Refraction, O's Semid. and Parallax),

FOR APPROXIMATE USE AT SEA.

The SUN. Add the Corr. to the Alt. of the Lower limb

4

5

6

Height of the Eye in Feet

10 12 14 16 18 20 22

2

N.

8 7 7

8 8 8

7

8

9

9

9

ΙΟ

10 IO

ΙΟ IO 10

9

2334456

o

4 36

3

1223 + + 506677 ∞ ∞ a ala

O

о

I

I

2

5 0

I

30

6 0

2

3

3

8 0

5 9 0

5 10 0 611

612 0 14

16

30

7 0

18

8

9

6

ΙΟ IO 60

0

II IO ΙΟ 1Ο 70
II II ΙΟ 80 0
II II IO 90

CORRECTION OF THE MOON'S APPARENT ALTITUDE

(Barometer, 30 inches. Fahrenheit's Thermometer, 50°)

App.
Alt.

0 0 19 14 20 1421 1422

59' 60' 61'

Cor. for

'of Alt.

14 25 14 26

14 27 14

628

51 29

51 30 51 20

28 31

28 32 28 30

5832

58 33

58

40

21 34

2135 21

50

50

50 45 446 347 348 249 250 151 152 153 ᄋ 50

6666

12345

8

18

28

38

48

58

7 0 45 12 46 12 47 1148 1149 1150 1051 1052 953 9 0 10 45 2146 2047 2048 1949 1950 1851 1852

20 46 747 748 649 550 551 452 453
30 46 1347 12 48 1249 1150 1051 1052 953 854 8 30
40 46 1847 1748 1749 16 50 1551 1552 1453 13 54 13 40
50 46 2347 2348 22 49 2150 2051 2052 1953 1854 18

046 28 47 27 48 10 46 3347 32 48 20 46 3747 36 48 30 46 4147 4148 40 46 45 47 45 48 50 46 4947 48 48

27 49 2650 25 51
3149 3150 30 51
36 49 36 50 35 51
40 49 39 50 38 51
44 49 43 50 4251
47 49 47 50 46 51

24 52 24 53
29 52 28 53
34 52 34 53
37 52 37 53
41 52 40 53
4552 44 53

354 2 20

20

22 24

26

30

32 34 36

28 3 38

40

50

49

51 53 55

23 54 22 0
28 54 27 10
33 54 32 20
36 54 35 30
39 54 39 40
43 54 42 50

о 2 4 10 12 14 20 22 24 30 32 34 39 41 43 49 51 53

42 44 46 47 5 57 6

6 8 74

26

36

55

666655

18

28 915

37

45 47

57

(Barometer, 30 inches.

CORRECTION OF THE MOON'S APPARENT ALTITUDE
Fahrenheit's Thermometer, 50°)

60' 61'

0 о

add

50 54 49

10

10 12

20 47

047 59 48

58 49

57 50

56 51

5552

54 53

53 54

52

20

20

22

24 26 28

1234

887

37

50 47 848 749 650

155 c 50

44

41 43 45 47

23+4

53 55 57