1 navigationnavigation. 2 chapter 6 sight planning navigationnavigation
TRANSCRIPT
Set up star finder for any location & time
Plot planets, sun & moon on star finder
Use “Sight Planner “ in Celestial Tools
Select suitable bodies for fixes
Identify unknown celestial body
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Learning ObjectivesLearning ObjectivesLearning ObjectivesLearning Objectives
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Sight ConsiderationsSight ConsiderationsSight ConsiderationsSight ConsiderationsStars & Planet Sights:Usable observation period - 15 to 45 minMorning: maybe an hour before sunriseEvening: brightest until no longer see horizon
Moon Sights:Daytime: 2-body fix with sunTwilight: 2/3-body fix with sun/star/planet
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Sight ConsiderationsSight ConsiderationsSight ConsiderationsSight ConsiderationsTwilight Sights:Predict altitudes & ZnMorning - bodies to the west firstBrightest bodies firstTake sights on any bright body
Daylight Sights:Sun near MT, bearing changes rapidly Moon/Venus occasionally visibleSun-Moon after/before 1st & last quarter
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Sight ConsiderationsSight ConsiderationsSight ConsiderationsSight ConsiderationsIdeal LOP separations for fix:90° for 2-body, minimum 45°120° for 3-body, minimum 30°
Sun
0830 Moon
0845
Sun
0830 Moon
0845
Venus 0850
MPP
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Sight PlanningSight PlanningSight PlanningSight Planning Internet & App’s
Computers – Celestial Tools
Star Finder
Nautical Almanac
Manual Tool – backup
For any given time & location, determine:
Approximate altitude & Zn of bodies Navigational stars, sun, moon &
navigational planets
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Star FinderStar FinderStar FinderStar Finder
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Star Base
Celestial Sphere Northern Hemisphere Southern Hemisphere Poles at center of disc Celestial Equator 4” circle Shows Navigational Stars Relative magnitude LHA scale, Aries at 0° Right Ascension (RA)
Star FinderStar FinderStar FinderStar Finder
RA: 24°SHA: 336°Total: 360°
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Overlay Plot planets, sun & moon North/South side Declination circles Meridian angle scale Plotting slot
Star FinderStar FinderStar FinderStar Finder Red Template
Blue Template
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Overlay 10° intervals, 5° - 85° Nearest your DR North/South side Blue grid visible area (mount & align LHA 310°) Center cross is zenith Outer ring is horizon Radial lines are azimuth Curved lines are altitude
Star FinderStar FinderStar FinderStar Finder
Blue Template
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LATITUDE 45°N overlay Mount on Star Base Align arrow with LHA 259° 7 - 1st Mag stars visible?
Star Finder ExerciseStar Finder ExerciseStar Finder ExerciseStar Finder Exercise
Antares hs 18 Zn 192Spica hs 14 Zn 240Arcturus hs 45 Zn 252Capella hs 2 Zn 179Deneb hs 55 Zn 70Vega hs 75 Zn 115 Altair hs 42 Zn 125
What are their hs & Zn?
What about the sun, moon, Venus, Mars, Jupiter, & Saturn?
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Star Finder ExerciseStar Finder ExerciseStar Finder ExerciseStar Finder Exercise4/14 45 25.6N 45.4 92
30.0W6
45.445.0
0.4
50N45N5
04350446
-11
0.18 0446 0446
92.590.02.5 1
00446
0456
+50956
956
337 42.114 02.3351
44.4-92 30.0259 14.4 259
314 56.3269 42.0333 17.0336 34.0287 09.7142 14.4
314.9269.7333.3336.6287.2142.2
351.7
36.882.026.723.472.8
217.8
9.5N19.9N10.1N9.4N22.1N12.0S
Morning CT
14 02.3
1. Determined LMT for DR Lat. 2. Adjust LMT for DR Lo. 3. Compute UT. 4. Determine LHA of Aries. 5. Look up GHA, SHA and Dec. 6. Enter the GHA for Aries.7. Determined RA for bodies.
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Star Finder ExerciseStar Finder ExerciseStar Finder ExerciseStar Finder Exercise Mount Red Template on Star Base Align arrow with RA for Sun Using slot on template, place dot at 10° N Dec
and label with symbol (use pencil) Repeat for other bodies
RA37°82° 27° 23°73°
218°
BodySun Moon VenusMarsJupiterSaturn
Dec10° N 20° N 10° N 09° N22° N12° S
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Star Finder ExerciseStar Finder ExerciseStar Finder ExerciseStar Finder Exercise
ħ
Replace with LATITUDE 45°N overlay
Align arrow with LHA 259°
What are the hs & Zn for these bodies?
Saturn: hs 22° Zn 223°
Take bearing of body Set star finder for time of sight
Altitude & approx. bearing Bodies on star base located in vicinity
Reduce sight If correct, intercept close to DR
If star is not very bright, may not be nav. star List of stars, pg 268 - 273 NA Estimate SHA & Dec; look it up in star list
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Star IdentificationStar IdentificationStar IdentificationStar Identification
Hudson Wi Mar 24, 2013 10:05 PM
2020
Next week bring your calculator or abacus
CHAPTER 3
LHA, Dec, Ho
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