19. The Complete Day

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19. The Complete Days Work

• Presented By Kelly Curtin, Asst. Professor

2
Course Outline

1. Navigational Astronomy Lecture 1 2
2. Mean Time / Apparent Time Lecture 3
3. Time Zones, Zone Description, Chronometer Time
   Lecture 4
4. The Earth, Celestial, And Horizon Coordinate
   System Lecture 5 6
5. The Spherical Triangle Lecture 7
6. Circle of Equal Altitude Intercept Lecture 8
7. Time Diagram, Right Ascension Lecture 9
8. The Nautical Almanac, Finding GHA, LHA, and
   Dec. Lecture 10 11
9. Instruments For Celestial Navigation Lecture 12
10. Sight Reduction of the Sun, Stars, Planets,
    Moon Lecture 13 - 15
11. Plotting and Advancing / Retarding the Assumed
    Position Lecture 16
12. Calculating Time of Meridian Passage (LAN)
    Lecture 17
13. Calculating Latitude at Meridian Passage Lecture
    18
14. Calculating Time of Sunrise/ Sunset/ Twilight
    Lecture 19
15. Star Shooting Schedule / Pub. 249 Lecture 20
16. Azimuth and Amplitudes Lecture 21 24
17. Polaris Azimuth and Latitude By Lecture 25
18. Star Finder Stars, Planets, Selecting the 3
    best Stars Lecture 26
19. The Complete Days Work Lecture 27 28

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IXX Complete Days Work - Plotting
Days Work Requirements
EXAMPLE OF A DAYS WORK PLOT
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IXX Complete Days Work - Plotting
Days Work Requirements

• The following calculations are what would
  normally be required for a ½ days work AM
  calculations only.
• The Date is 19 September 1981, your 0300 zone
  time position is Lat. 24 35.0N, Long. 088
  40W. You are on course 288T
• at a speed of 14 knots.
• 1. Pre-compute Star-Time and list the 7
  selected stars from Pub. 249
• 2. The following stars are observed during
  Star-Time
• Body Zone Time Hs
• Regulus 0530 22 56.9
• Sirius 0532 44 41.0
• Hamal 0536 43 26.9
• The index error is 2.0 on the arc and your
  height of eye is 58 feet. What are the Latitude
  and Longitude of your 0600 R-Fix?
• 3. Just after sunrise at 0550-00s you observe
  an amplitude of the sun on the celestial horizon,
  The sun is bearing 089.5 PGC.
• What is the Gyro Error? You perform a
  compass check and the vessel is heading 289 PGC
  and 283 PSC.
• If the variation in the area is 8E, What
  is the deviation of the magnetic compass on this
  heading?

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1 DR POSN _at_ Civil Twilight 0525 DR POSN L
24 46N ?089 14W
Sunrise
Naut
Civil
0455 -2 0501 -2 0459 -3 0456
0523 -1 0526 -1 0525 -3 0522
30 N 24 46 N 20 N
0547 -0 0548 0 0548 -3 0545
10
6m
3m
1m
4 46
Correction for DLO -3 min 46 of Arc East of
Central Meridian 90
0509
0534
Star Time
Selected Stars
ZT 0509 ZD 6 GMT 1109 GHA? 163 15.7 Inc. 2
15.4 GHA? 165 31.1 -w? 089 14.0 LHA? 076
17.1 LHA? 076 _at_ 0508

• TIME STAR Hc Zn ? Hc
• 0508 Cappella 68 50 006 7
• 0512 Dubhe 22 19 031 27
• 0516 Pollox 55 38 076 53
• 0520 Procyon 50 19 114 50
• 0524 Sirius 43 23 151 29
• 0528 Rigel 56 44 184 4
• 0532 Hamal 44 31 279 53

6
2 Regulus Sirius
Hs 22 56.9 i.c -2.0 Dip -7.4 HA 22
47.5 Body -2.3 Ho 22 45.2 Hc 23
02.7 Int 17.5 Adv/Ret. Adv. 7nm
Hs 44 41.0 i.c -2.0 Dip -7.4 HA 44
31.6 Body -1.0 Ho 44 30.6 Hc 44
23.1 Int 7.5 Adv/Ret. Adv. 6.5nm
ZT 0530 ZD 6 GMT 1130 GHA? 163 15.7 m/s 7
31.2 GHA? 170 46.9 SHA 208 09.6 GHA 018
56.5 -west a ? 088 56.5 LHA 290 00.0 DEC 12
03.6 N same Alat 25 N Hct 23 01.3 (d) (22.5)
1.4 Hc 23 02.7 Z 087.1 Z Diff. (-1.0)
-.1 Z 087.0 ZN 087.0
ZT 0532 ZD 6 GMT 1132 GHA? 163 15.7 m/s 8
01.3 GHA? 171 17.0 SHA 258 55.2 GHA 070
12.2 -west a ? 089 12.2 LHA 341
00.0 DEC 16 41.3 S cont. Alat 25 N Hct 45
00.7 (d) (-54.6) 37.6 Hc 44 23.1 Z 153.7 Z
Diff. (.6) .4 Z 154.1 ZN 154.1
A
T
7
3 Hamal
Hs 43 26.9 i.c -2.0 Dip -7.4 HA 43
17.5 Body -1.0 Ho 43 16.5 Hc 43
43.5 Int 27.0 Adv/Ret. Adv. 5.6nm
ZT 0536 ZD 6 GMT 1136 GHA? 163 15.7 m/s 9
01.5 GHA? 172 17.2 SHA 328 27.9 GHA 140
45.1 -west a ? 089 45.1 LHA 051
00.0 DEC 23 22.5 N same Alat 25 N Hct 43
38.5 (d) (13.3) 5.0 Hc 43 43.5 Z 081.3 Z
Diff. (-1.3) -.5 Z 080.8 ZN 279.2
A
Ans
0600 R Fix L 24 53.0 N ? 089 22.0 W
8
0550 DR POSNL 24 51.0 N? 089 19.0 W
3 ZT 0550 ZD 6 GMT 1150
DEC. N 1 25.6 (d 10) -.8 DEC. N 1 24.8
Sin A Sin Declination Cos Latitude
Sin A Sin 1.413 Cos 24.850
088.4
1.6
090
Amplitude Angle A 1.6
True Amplitude E/W 1.6 N/S A
Rising or Setting
Declination
True 0 088.4
PGC 0 089.5
GE 1.1 W
C D M V T GE PGC 283 3.1W 279.9 8E 287.9 1.1
W 289
9
0930 DR POSNL 24 58.0 N? 089 56.0 W
4 ZT 0815 36s ZD 6 GMT 1415 - 36
LAT 24 58.0 N
GHA 031 34.2 3 54.0 GHA 035 28.2 - W
? 089 56.0 LHA 305 32.2
DEC. N 1 22.7 (-1.0) -.3 DEC. N 1 22.4
LHA 305 32.2 Dec N 1 22.4 Lat N 24
58.0 Base Z 104.9 CORN 0.4 Z 105.3 ZN 105.3
Base Z 104.9 104.9 104.9
TAB Z 105.4 103.8 105.5
Z DIFF /- .5 -1.1 .6
INC. 32.2/60 22.4/60 58/60
CORN .27 - .41 .58 Total .4
True ? 105.3 PGC ? 106.0 GE ? .7 W
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0930 DR POSNL 25 03.5 N? 090 14.0 W
5 ZT 0930 - 26 ZD 6 GMT 1530 - 26
GHA 046 34.4 7 36.5 GHA 054 10.9 - W
? 090 10.9 LHA 324
DEC. N 1 21.7 N (-1.0) -.5 DEC. 1 21.2 N
HCT 305 32.2 (d 36.2) 1 22.4 Hc 24
58.0 Z 104.9 (Z diff)(-1.2) -
0.4 Z 105.3 ZN 105.3
Hs 47 49.2 I.C. - 2.0 Dip - 7.4 Ha 47
39.8 body 15.1 Ho 47 54.9 Hc 47
59.2 INT A 4.3nm
11
6 Pre-Compute Time of LAN
1154 DR POSNL 25 13.5 N? 090 50.0 W
17H 076 34.8 090 50.0 GMT 1751-01s
ZD 6 -6 (Rev) ZT 1151 01 LAN
14 15.2 51m 01s
12
7 ZT 1156 - 45 ZD 6 GMT 1756 - 45
Hs 43 26.9 i.c -2.0 Dip -7.4 HA 43
17.5 Body -1.0 Ho 43 16.5
DEC. N 1 21.7 N (-1.0) -.5 DEC. 1 21.2 N
ZENITH DISTANCE (90) 89 60.0
- HO 66 03.1 ZEN. DIST. 23
56.9
LATITUDE ZEN. DIST. /- DECLINATION
23 56.9N 1 21.2 N 25
15.8 N 1200 LAT .2 25 16.0
N
1157 1200 3 min Dist .7nm CHANGE IN
LATITUDE l D cos C l .7 cos 72 l
.2 nm
Ans
1200 R Fix L 25 16.0 N ? 090 49.0 W
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