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Chapter 6 Chapter 6 Sight PlanningSight Planning

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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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How many sights do you need for the sight folder?

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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 (white disc) Red Template

Blue Template

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

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Celestial ToolsCelestial ToolsCelestial ToolsCelestial Tools

2020

Next week bring your calculator or abacus

CHAPTER 3

LHA, Dec, Ho

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The End

Sight PlanningSight PlanningSight PlanningSight Planning