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8 ALMANAC AND TIDE TABLE.

EXEMPLIFICATION AND CONSTRUCTION OF THE FOLLOWING TABLES.

TO FIND THE TlilE OF HIGH WATER AT AKY PLACE IN THE GENERAL TIDE TABLE.

EtTLE. — To the time of high water at Glasgow on the given day, add or subtract the correction for the

required place as stated in the table, and the time of high water will be obtained. When the sum of the

correction, and of the time of high water in the table exceeds 12 hours, subtract 12 hours, and the remainder

will be the time of high water in the morning or evening of the given day, as the column denotes ; when

the sum of the former quantities is less than 12 hours, this sum will be the time of high water required in

the evening of the preceding day, or the morning of the given day, according as the column is marked

morning or evening. Or the morning and the evening tides may be found thus : — If the morning tide be

sought, and the sum be above 12 hours, take the time from Glasgow for the preceding evening, to which

add the correction for the required place ; from the sum subtract 12 hours, and the remainder is the morning

tide at the place required. If the evening tide is wanted, and the sum exceed 12 hours, take the Glasgovr

morning tide for the given day, to which apply the correction for the required place, from the sum subtract

12 hours, and the remainder is the evening tide at the place required.

Required the time of high water at Peterhead, July 10th, 1866. h. m.

High water at Glasgow, July 10th, 11 39 a.m.

Correction for Peterhead, 1 3

High water at Peterhead, 10 36 a.m.

Required the time of high water at London Bridge, August 10th, 186G. ii. m.

High water at Glasgow, August 10th, 1866, 1 56 p.m.

Correction for London Bridge, -j- 30

High water at London Bridge 2 26 p.m.

Astronomical Seasons of the Tear 1866. — Spring begins, or the sua enters Aries, March 20, 7 h.

65 m. P.M. ; summer begins, or the sun enters Cancer, June 21, 4 h. 33 m. p.m. ; autumn begins, or the sun

enters Libra, Sept. 23, 6 h. 51 m. a.m. ; winter begins, or the sun enters Capricornus, Dec. 22, h. 49 m. a.m.

July 6th, 1866, the sun's longitude is 104° 7'; and the obliquity of the ecliptic 23° 27' 14''; required

the sun's declination at noon.

To the log. sine of the sun's longitude at noon, 104° 7' 1", 9-986CS9

Add the log. sine of the obliquity of ecliptic, 23° 27' 14", 9-599896

To the sine of the sun's declination, 22° 42' 19," 9-586685

Required the time of rising and setting of the sun at Glasgow, July 10th, 1866, in lat. 55° 52' N..

long. 4° 16' W.

The approximate time of the rising and setting is :

Rising, 3 h. 32 m. Setting, 8 h. 28 m.

Longitude of Glasgow, 17 Longitude of Glasgow, 17

3 49 8 45

The sun's declination reduced to these times is 22° 18' and 22'^ 12', and the polar distances are 67° 4'2

and 67° 48' — the horizontal refraction less the sun's parallax. Hence the following computation : —

Zenith distance, 90° 33' 90° 33'

Polar distance 67 42 co-secant 0'033760 67 48 co-secant 0-033450

Co-latitude, 34 08 co-secant 0-250944 34 08 co-secant 0-250944

192 23

96 11

5 38

II.

M.

s.

1

42

48

2

3

25

36

Equation of time,.,.

+

4

57

3

30

33

Longitude iu time,.

•-t-

17

Time of rising,

3

47

33

192

29

sine 9-997466

96

14

sine 9-997425

sine 8-991943

5

41

sine 8-995768

2)19-274113

2)19-277587

sine 9-637056

co-sine 9-638793

H. M. S.

4 16 48

2

8 33 36

Equation

of time,,.. 5 3

8 38 39

Longitude in time,.. -}- 17

Time of setting, 8 55 39

JAMES YUILLE,

Teacher of Mathematics, Navigation, and Nautical Astronomy.

EXEMPLIFICATION AND CONSTRUCTION OF THE FOLLOWING TABLES.

TO FIND THE TlilE OF HIGH WATER AT AKY PLACE IN THE GENERAL TIDE TABLE.

EtTLE. — To the time of high water at Glasgow on the given day, add or subtract the correction for the

required place as stated in the table, and the time of high water will be obtained. When the sum of the

correction, and of the time of high water in the table exceeds 12 hours, subtract 12 hours, and the remainder

will be the time of high water in the morning or evening of the given day, as the column denotes ; when

the sum of the former quantities is less than 12 hours, this sum will be the time of high water required in

the evening of the preceding day, or the morning of the given day, according as the column is marked

morning or evening. Or the morning and the evening tides may be found thus : — If the morning tide be

sought, and the sum be above 12 hours, take the time from Glasgow for the preceding evening, to which

add the correction for the required place ; from the sum subtract 12 hours, and the remainder is the morning

tide at the place required. If the evening tide is wanted, and the sum exceed 12 hours, take the Glasgovr

morning tide for the given day, to which apply the correction for the required place, from the sum subtract

12 hours, and the remainder is the evening tide at the place required.

Required the time of high water at Peterhead, July 10th, 1866. h. m.

High water at Glasgow, July 10th, 11 39 a.m.

Correction for Peterhead, 1 3

High water at Peterhead, 10 36 a.m.

Required the time of high water at London Bridge, August 10th, 186G. ii. m.

High water at Glasgow, August 10th, 1866, 1 56 p.m.

Correction for London Bridge, -j- 30

High water at London Bridge 2 26 p.m.

Astronomical Seasons of the Tear 1866. — Spring begins, or the sua enters Aries, March 20, 7 h.

65 m. P.M. ; summer begins, or the sun enters Cancer, June 21, 4 h. 33 m. p.m. ; autumn begins, or the sun

enters Libra, Sept. 23, 6 h. 51 m. a.m. ; winter begins, or the sun enters Capricornus, Dec. 22, h. 49 m. a.m.

July 6th, 1866, the sun's longitude is 104° 7'; and the obliquity of the ecliptic 23° 27' 14''; required

the sun's declination at noon.

To the log. sine of the sun's longitude at noon, 104° 7' 1", 9-986CS9

Add the log. sine of the obliquity of ecliptic, 23° 27' 14", 9-599896

To the sine of the sun's declination, 22° 42' 19," 9-586685

Required the time of rising and setting of the sun at Glasgow, July 10th, 1866, in lat. 55° 52' N..

long. 4° 16' W.

The approximate time of the rising and setting is :

Rising, 3 h. 32 m. Setting, 8 h. 28 m.

Longitude of Glasgow, 17 Longitude of Glasgow, 17

3 49 8 45

The sun's declination reduced to these times is 22° 18' and 22'^ 12', and the polar distances are 67° 4'2

and 67° 48' — the horizontal refraction less the sun's parallax. Hence the following computation : —

Zenith distance, 90° 33' 90° 33'

Polar distance 67 42 co-secant 0'033760 67 48 co-secant 0-033450

Co-latitude, 34 08 co-secant 0-250944 34 08 co-secant 0-250944

192 23

96 11

5 38

II.

M.

s.

1

42

48

2

3

25

36

Equation of time,.,.

+

4

57

3

30

33

Longitude iu time,.

•-t-

17

Time of rising,

3

47

33

192

29

sine 9-997466

96

14

sine 9-997425

sine 8-991943

5

41

sine 8-995768

2)19-274113

2)19-277587

sine 9-637056

co-sine 9-638793

H. M. S.

4 16 48

2

8 33 36

Equation

of time,,.. 5 3

8 38 39

Longitude in time,.. -}- 17

Time of setting, 8 55 39

JAMES YUILLE,

Teacher of Mathematics, Navigation, and Nautical Astronomy.

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Scottish Post Office Directories > Towns > Glasgow > Post-Office annual Glasgow directory > 1865-1866 > (44) |
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Permanent URL | https://digital.nls.uk/84371888 |
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Description | Directories of individual Scottish towns and their suburbs. |
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Description | Around 700 Scottish directories published annually by the Post Office or private publishers between 1773 and 1911. Most of Scotland covered, with a focus on Edinburgh, Glasgow, Dundee and Aberdeen. Most volumes include a general directory (A-Z by surname), street directory (A-Z by street) and trade directory (A-Z by trade). |
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