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Navigation. Sight Folder Requirements. hs between 15 º and 75 º ; LOP with 3.0nm. 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

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slide2

Sight Folder Requirements

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

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

3

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.

3

APPENDIX D

3

3

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

3

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

6

Minimum of 21 sights

7 SR Form / 6 CLS SAP

slide4

Navigation

Chapter 1

View of our Solar System

Chapter 2 Sunrise … Sunset

slide5
Apparent motion

‘First Point of Aries’

Sidereal Hour Angle (SHA)

Difference between solar & sidereal time

Difference between LMT & ZT

Determine ZT Sun/Moon rise/set

Determine ZT civil & nautical twilight

Learning Objectives

5

slide6

Jun 21

Sep 22

Dec 21

Mar 20

Night Sky

-21.3sec

+29.9sec

+31.1sec

-18.1sec

Solar Time

Orbit time: 31,536,000 SI seconds 86,400.002 seconds/day

6

slide7

Night Sky

SUMMER SOLSTICE

NP

Jun 21 Dec 23º 26.1’ N

SP

7

slide8

Night Sky

AUTUMNAL EQUINOX

NP

Sep 22 Dec 0º 00.0’

SP

8

slide9

Night Sky

WINTER SOLSTICE

NP

Dec 21 Dec 23º 26.1’ S

SP

9

slide10

Night Sky

VERNAL EQUINOX

NP

Mar 20 Dec 0º 00.0’

SP

First point of Aries ()

10

slide11

Night Sky

Sidereal Time

23hr 56min 4.0916sec

11

slide12

Celestial Equator

Ecliptic

Aries

12

slide13

GHA = SHA + GHA

Dubhe SHA 193° 51.3’

Celestial Equator

N P

Aries NA1800 GHA 88° 25.8’

Aries

G

13

slide14

Sight Reduction Form

19 Mar 20xx

Dubhe

13-00-00

00-03

45

00 0

+

13-00-00

92

30 0

5

+

18-00-00

20 Mar 20xx

g

?

193

51 3

G

18

88

25 8

?

0

00 0

00 - 00

?

282

17 1

92

30 0

?

189

47 1

14

slide15

Night Sky

VENUS

MARS

JUPITER

MOON

SATURN

15

slide16

Navigator’s Solar System

Sun – Moon – 4 Planets – 57 Stars

-26.7

-13.2

NA

South Declination 1st Magnitude

North 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)

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)

16

slide17

Betelgeuse

Bellatrix

Alnilam

Capella

Rigel

17

slide18

Horizon, planets and brightest stars visible

Morning Sights

Between beginning of CT and sunrise

Evening Sights

Between sunset and end CT

0643 – 0712 29min

1923 – 1952 29min

18

slide20

Solar P-hen-omen-a

  • Sunrise (SR)
  • Sunset (SS)
  • Twilight
    • Civil Twilight (CT)
    • Nautical Twilight (NT)
slide21

Local Mean & Zone Time

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

DLo – difference between your Lo and referenced meridian.

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

slide22

Local Mean & Zone Time

1814 ZT

1814 LMT

92.5° W

?

97.5° W

ZM 90° W

82.5° W

ZD +6

slide23

Local Mean & Zone Time

Zone Time: 1814

Location: Lo 92° 42.6’ W

  • FIND ZM:
  • FIND DLo:
  • DLo to TIME:
  • LMT:

92° 43’ – 90° = 2° 43’ = 2.7°

2.7° x 4min = 10.8min; rounded 11min

(15° in 1hr; 1° in 4min)

1814 - 11min = 1803

slide24

Predicting Phenomena

Location: L 48° 20.7’ N Lo 92° 42.6’ W

Find LMT for beginning of morning CT.

Tab Lat LMT CT

50° 0718

45°0704

5°14min

Latitude: 48° 20.7’ N

45° 00.0’ N

3° 20.7’ = 3.35°

slide25

Predicting Phenomena

Diff Tab Lat: 5°

Diff LMT: 14min

Diff Lat: 3.35°

LMT CT L 45° N 0704

Corr for L 48° 20.7’ N 9min

LMT CT L 48° 20.7’ N 0713

+

slide26

Predicting Phenomena

LMT CT L 48° 20.7’ N 0713

DLo = DR Lo – ZM

Lo 92° 43’ W

ZM 90° 00’ W

DLo 2° 43’ W = 2.7°

2.7° x 4min = 10.8 rounded 11min

LMT 0713

DLo (W) + 11

LMT for CT 0724

slide27

Predicting Phenomena

How would I use this skill?

slide28

Predicting Phenomena

ABOARD MOVING VESSEL

“First Estimate”

ZT 0000 GPS Position

L 45° 26’ N; Lo 11° 39’ W

Course 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?

slide29

Predicting Phenomena

ABOARD MOVING VESSEL

“First Estimate”

0627-0000 = 6hr 27min = 387min

How far will you travel by tab LMT NT?

Plot projected 0627 DR position

slide30

Predicting Phenomena

0000 GPS

0000 GPS

L 45° 26’ N

Lo 11° 39’ W

C 115 S 9.0

20’

10’

Projected

L 45° 01.5’ N

Lo 10° 46.4’ W

0627

45°N

50’

50’

40’

30’

20’

10’

11° W

40’

slide31

Predicting Phenomena

ABOARD MOVING VESSEL

“First Estimate”

Projected DR

L 45° 01.5’ N - Lo 10° 46.4’ W

Tab L LMT NT

50° N 0637

45° N0627

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?

slide32

Predicting Phenomena

ABOARD MOVING VESSEL

“First Estimate”

What’s the LMT NT at projected Lat?

LMT NT: 0627 + 0 = 0627

slide33

Predicting Phenomena

ABOARD MOVING VESSEL

“First Estimate”

LMT Projected Lat = 0627

DLo: 15° 00.0’ W – 10° 46.4’ W

4° 13.6’ W = -4.2°

What’s the LMT NT at projected DR?

What’s the arc to time conversion?

4.2° x 4min = 16.8min

rounded 17min

What’s your DLo?

LMT NT: 0627 – 17min = 0610

slide34

Navigation

Next week bring your calculator or abacus

CHAPTER 6

SIGHT PLANNING