1 navigationnavigation. 2 line of position (lop) using the sun from run of at least three qualified...

11

NavigationNavigationNavigationNavigation

22

Line of Position (LOP) using the Sun from run of at least three qualified sights

Line of Position (LOP) using the Moon from run of at least three qualified sights

Line of Position (LOP) using a Star from run of at least three qualified sights

Line of Position (LOP) using a Planet from run of at least three qualified sights

Meridian Transit of the Sun from run of at least three sights with one sight within 10 sec of MT

2-body Fix using any two bodies from a run of at least three qualified sights each; taken within 20 mins and intersection of LOP’s not less than 45º

Any one of these sights must be reduced and plotted by the Nautical Almanac Sight Reduction (NASR) method. One sight from each of the other three must be reduced and plotted using the Law of Cosines (LOC) method.

Sight within 10sec of calculated MT reduced using the Meridian Transit SR form.

Selected sights must be reduced and plotted by both the NASR and LOC method.

3

3

3

3

3

6

Minimum of 21 sights

hs between 15º and 75º; LOP with 3.0nm

7 SR Form / 6 CLS SAP

Sight Folder RequirementsSight Folder RequirementsSight Folder RequirementsSight Folder Requirements

APPENDIX D

33

NavigationNavigationNavigationNavigationMonda

yTuesda

yWednesda

yThursda

yFriday Saturda

ySunday

31 Mar 1 April 2 3 4 5

1123-1223

6

1122-1237

7

1125

8 9 10 11 12

1321-1341

13

1409-1529

14

1502-1657

15

1546-1726

16

1634-1729

17

1717-1727

18 19 20

21 22 23 24 25 26 27

28 27 30 1 May 2 3

1127

4

1130-1235

5

1129-1259

6

1128-1228

7

1131-1141

8 9 10 11

44

Chapter 1Chapter 1View of our Solar SystemView of our Solar System


Chapter 2 Chapter 2 Sunrise … SunsetSunrise … Sunset

Apparent motionApparent motion ‘‘First Point of Aries’First Point of Aries’ Sidereal Hour Angle (SHA)Sidereal Hour Angle (SHA) Difference between solar & sidereal Difference between solar & sidereal

time time Difference between LMT & ZTDifference between LMT & ZT Determine ZT Sun/Moon rise/setDetermine ZT Sun/Moon rise/set Determine ZT civil & nautical twilightDetermine ZT civil & nautical twilight

55

Learning ObjectivesLearning ObjectivesLearning ObjectivesLearning Objectives

66

Jun 21

Sep 22

Dec 21

Mar 20

Night SkyNight SkyNight SkyNight Sky

Solar TimeOrbit time: 31,536,000 SI seconds

86,400.002 seconds/day

-18.1sec

+31.1sec

-21.3sec

+29.9sec

http://en.wikipedia.org/wiki/File:The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA's_Solar_Dynamics_Observatory_-_20100819.jpg

77

SUMMER SOLSTICE


NP

SP

Jun 21 Dec 23º 26.1’ N


http://en.wikipedia.org/wiki/File:The_Earth_seen_from_Apollo_17.jpg

88

AUTUMNAL EQUINOX


NP

SP

Sep 22 Dec 0º 00.0’



99

WINTER SOLSTICE


NP

SP

Dec 21 Dec 23º 26.1’ S



1010

Mar 20 Dec 0º 00.0’

VERNAL EQUINOX

First point of Aries ()


NP

SP



1111


Sidereal Time23hr 56min 4.0916sec




1212

Celestial Equator

Ecliptic

Aries



1313

Celestial Equator

Aries

N P

Dubhe SHA 193° 51.3’

Arie

s NA

1800

GH

A 8

8° 2

5.8’

G

GHA = SHA + GHA

19 Mar 20xx

13-00-00

13-00-00

00-03+

+ 518-00-00

20 Mar 20xx

Dubhe

1414

4592

00 030 0

193 51 3

18 88 25 800 - 00 0 00 0

282 17 1

92 30 0– 189 47 1

Gg

?

?

?

?

Sight Reduction FormSight Reduction FormSight Reduction FormSight Reduction Form

1515

VENUS

MARSJUPITER

SATURN

MOON


1616

Sun – Moon – 4 Planets – 57 Stars

South Declination 1st Magnitude

Sirius (-1.5) Canopus (-0.7) Rigil Kentaurus

(-0.3) Rigel (0.1) Achernar (0.5) Spica (1.0) Antares (1.0)

Fomalhaut (1.2) Acrus (1.3) Adhara (1.5) Gacrux (1.6) Shaula (1.6)

Sirius (-1.5) Canopus (-0.7) Rigil Kentaurus

(-0.3) Rigel (0.1) Achernar (0.5) Spica (1.0) Antares (1.0)

Fomalhaut (1.2) Acrus (1.3) Adhara (1.5) Gacrux (1.6) Shaula (1.6)

Navigator’s Solar SystemNavigator’s Solar SystemNavigator’s Solar SystemNavigator’s Solar System

North Declination 1st Magnitude

Arcturus (0.0) Vega (0.0)

Betelgeuse (0.1) Capella (0.1)

Procyon (0.4) Altair (0.8)

Aldebaran (0.9) Regulus (1.1) Pollux (1.1)

Deneb (1.3) Bellatrix (1.6)

Arcturus (0.0) Vega (0.0)

Betelgeuse (0.1) Capella (0.1)

Procyon (0.4) Altair (0.8)

Aldebaran (0.9) Regulus (1.1) Pollux (1.1)

Deneb (1.3) Bellatrix (1.6)

-26.7 -13.2 NA

1717

Betelgeuse

Bellatrix

Rigel

Alnilam

Capella

1818

Morning Sights

Between beginning of CT

and sunrise

Evening Sights

Between sunset and end CT

Horizon, planets and brightest stars visible

0643 – 0712 29min

1923 – 1952 29min

2020

Solar P-hen-omen-aSolar P-hen-omen-aSolar P-hen-omen-aSolar P-hen-omen-a Sunrise (SR)Sunrise (SR)

Sunset (SS)Sunset (SS)

TwilightTwilight

Civil Twilight (CT)Civil Twilight (CT)

Nautical Twilight (NT)Nautical Twilight (NT)

2121

Local Mean & Zone TimeLocal Mean & Zone TimeLocal Mean & Zone TimeLocal Mean & Zone TimeLocal Mean Time (LMT) – based on the mean sun with reference to the local celestial meridian.

Zone Time (ZT) – based on the nearest meridian with a longitude exactly divisible by 15°.

DLo – difference between your Lo and referenced meridian.

2222

Local Mean & Zone TimeLocal Mean & Zone TimeLocal Mean & Zone TimeLocal Mean & Zone Time

ZM 90° W

97.5° W 82.5° W

ZD +6

92.5° W

1814 ZT

?

1814 LMT

2323

Local Mean & Zone TimeLocal Mean & Zone TimeLocal Mean & Zone TimeLocal Mean & Zone TimeZone Time: 1814 Location: Lo 92° 42.6’ W

1. FIND ZM:

2. FIND DLo:

3. DLo to TIME:

4. LMT:(15° in 1hr; 1° in 4min)

92° 43’ – 90° = 2° 43’ = 2.7°

2.7° x 4min = 10.8min; rounded 11min

1814 - 11min = 1803

2424

Predicting PhenomenaPredicting PhenomenaPredicting PhenomenaPredicting PhenomenaLocation: L 48° 20.7’ N Lo 92° 42.6’ WFind LMT for beginning of morning CT.

Tab Lat LMT CT 50° 0718 45° 0704 5° 14min

Latitude: 48° 20.7’ N45° 00.0’ N 3° 20.7’ = 3.35°

2525

Predicting PhenomenaPredicting PhenomenaPredicting PhenomenaPredicting PhenomenaDiff Tab Lat: 5°Diff LMT: 14min

Diff Lat: 3.35°

LMT CT L 45° N 0704Corr for L 48° 20.7’ N 9min

LMT CT L 48° 20.7’ N 0713+

2626

Predicting PhenomenaPredicting PhenomenaPredicting PhenomenaPredicting Phenomena

LMT CT L 48° 20.7’ N 0713DLo = DR Lo – ZM

Lo 92° 43’ WZM 90° 00’ WDLo 2° 43’ W = 2.7°

2.7° x 4min = 10.8 rounded 11min

LMT 0713DLo (W) + 11LMT for CT 0724

2727


How would I use this skill?

2828


ABOARD MOVING VESSEL“First Estimate”

ZT 0000 GPS PositionL 45° 26’ N; Lo 11° 39’ WCourse 115° T; Speed 9.0kn

Tab L 45° N NT = 0627(Lo 15° W)

When do you need to be on deck for morning sights?

2929



How far will you travel by tab LMT NT?

0627-0000 = 6hr 27min = 387min

Plot projected 0627 DR position

3030


45°N

10’

20’

50’

50’ 40’11° W40’ 30’ 20’ 10’

0000 GPSC 115 S 9.0

0627ProjectedL 45° 01.5’ N Lo 10° 46.4’ W

0000 GPS L 45° 26’ N Lo 11° 39’ W

3131



Projected DRL 45° 01.5’ N - Lo 10° 46.4’ W

Tab L LMT NT50° N 063745° N 0627 5° 10min

45° 01.5’ N – 45° 00.0’ N = 1.5’

What’s are the differences in Tab Lat & LMT NT?

What’s the difference between EP Lat & Tab L?

3232


What’s the LMT NT at projected Lat?

LMT NT: 0627 + 0 = 0627


3333


What’s your DLo?What’s the arc to time conversion?What’s the LMT NT at projected DR?

DLo: 15° 00.0’ W – 10° 46.4’ W4° 13.6’ W = -4.2°

4.2° x 4min = 16.8min rounded 17min

LMT NT: 0627 – 17min = 0610


LMT Projected Lat = 0627

3434

Next week bring your calculator or abacus

CHAPTER 6

SIGHT PLANNING


View of our Solar View of our Solar System Sunrise / System Sunrise /

SunsetSunset

3535

The End

1 navigationnavigation. 2 line of position (lop) using the sun from run of at least three qualified...

Documents