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Celestial Navigation

Click here to review the new question databank from the NMC.

Click here to see instructions on using the new online study.

   Join the thousands of members who have successfully and affordably prepared for their Coast Guard Exam with SeaSources.net. If you do not see what you are looking for here go to the online study. When using the service we recommend using either Mozilla Firefox, Google Chrome, or the latest version of IE as a browser. Listed below is a table of contents of the questions on this subject as they appear in the new online study. If you arrived on this page by doing an internet search on this subject then you need to proceed to the Enter Online Testing Site link above and Register to create an account and get the full benefits of using this site. The latest multiple choice questions on this topic can be downloaded and installed to your computer by creating an account in the online study and installing the latest version of the "Betabox Software".

  The SeaSources Celestial Navigation Course is almost done.  When it is completed you will have all the necessary tools needed to study for the upon oceans endorsement to your license. The complete set of instructional videos as well as all related tables viewed below will be available to download soon directly through the betabox software at a cost of 5.00 per video Not a bad deal when you consider it could cost you up to $2000.00 to do the same thing in a classroom plus room and board.

Click on the links below to view the sample instructional videos on Celestial Navigation.

I suggest viewing these in "Full Screen" mode while running.

Introduction Video

Lesson 1: Corrections To Sextant Reading

Lesson 2: Dip Correction

Lesson 3: Apparent Altitude 

Lesson 4: Time, Watch Time

Lesson 5: Time, Chronometer Time

Lesson 6: Finding GHA and Declination

Lesson 7: Increments and Corrections Sun.

Lesson 8: Increments and Corrections Star.

Lesson 9: Assumed Position and Local Hour Angle

Lesson 10: Finding Computed Altitude and Azimuth

Lesson 11: Interpolation

Lesson 12: Altitude Intercept

Lesson 13: Position Plotting Sheets

Lesson 14: Plotting Lines of Position

Lesson 15: Combining all the lessons so far into a complete sight reduction problem. I still have a few details to tweak on this one but you can get the general idea.

Lesson 16: Finding Deviation or Gyro Error

Lesson 17: Finding Azimuth by 229 For Compass Correction

Lesson 18: Amplitudes

Lesson 19: Predicting Zone Time of Local apparent Noon

Lesson 20: Latitude by Meridian Altitude

Lesson 21: Latitude and Azimuth by Polaris

Lesson 22: Running Fixes

Lesson 23: Predicting Time of Sunrise / Sunset

Lesson 24: Star Identification. finishing this one now

 

 

 

 

The following topics listed below are covered in the course.

   Corrections to Sextant, Time, Finding GHA and Declination, Assumed Position and Local Hour Angle, Computed Altitude and Azimuth, Interpolation, Altitude Intercept, Using Position Plotting Sheets, Plotting Lines of Position, Finding Deviation or Gyro Error, Finding Azimuth By 229, Amplitudes, Zone Time of Local Apparent Noon, Latitude by Meridian Altitude, Latitude and Azimuth By Polaris, Running Fix, Time of Sunrise or Sunset, Star Identification and Selection, Loran Fix by Chartlet, Omega, RDF, Time Tick, Estimated Time of Arrival, Deviation Table Construction.

  • UNDER CELESTIAL NAVIGATION BOOK 5

    • NAVIGATION PROBLEMS

      • AMPLITUDE

        • SUN

      • AMPLITUDE/ANY OTHER BODY

        • JUPITER

        • MOON

        • SATURN

        • VENUS

      • AZIMUTH

        • ANY OTHER BODY

        • POLARIS

        • SUN

      • FIX OR RUNNING FIX

        • STAR

        • SUN

      • LATITUDE BY MERIDIAN TRANSIT

        • EX-MERIDIAN

        • LOWER TRANSIT - OTHER

        • SUN

      • LATITUDE BY POLARIS

        • ALL TOPICS

      • MISC. PROBLEMS

        • HO

        • LHA, ZN, A

      • STAR IDENTIFICATION

        • MAJOR

        • MINOR

      • STAR SELECTION

        • ALL TOPICS

      • TIME OF MERIDIAN TRANSIT

        • SECOND ESTIMATE

        • SUN

      • ZONE TIME CALCULATIONS

        • SUN RISE/SET

    • NAVIGATIONAL ASTRONOMY BOOK 3

      • CHARACTERISTICS OF CELESTIAL BODIES

        • MOON

        • MOTIONS OF CELESTIAL BODIES

        • PLANETS

        • STARS

        • SUN

      • COORDINATE SYSTEMS

        • CELESTIAL EQUATOR SYSTEM

        • EARTH SYSTEM

        • ECLIPTIC SYSTEM

        • HORIZON SYSTEM

      • NAVIGATIONAL TRIANGLE

        • ALTITUDES-HORIZONS

        • MISCELLANEOUS

        • SIDES/ANGLES

      • TIME

        • APPARENT TIME, EQ. TIME

        • MISCELLANEOUS

        • SIDEREAL TIME, LUNAR TIME, ETC.

        • SOLAR TIME, GMT, LMT, ZT

    • NAVIGATIONAL PROCEDURES

      • CELESTIAL NAVIGATION PROCEDURES

 

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Altitude intercept (a) the difference between hc and ho.

Watch time (w.t.) is the reading of your watch at the instant you make the sextant reading. The watch is set to the standard time of the time zone the boat is in.

Zone time (z.t.) is the correct time of the zone you're in.

Watch error (w.e.) is the amount of time the watch is slow (s) or fast (f). If the watch is slow, you add the error. If it's fast, subtract.

CHRONOMETER TIME (C.T.) what the chronometer reads, as set to GMT.

CHRONOMETER ERROR (C.E.) the amount of time it's slow or fast.

CORRECTED CHRONOMETER TIME (C.C.T.) the chronometer time corrected by adding slow C.E.'S and subtracting fast C.E.'S.

S.H.A. stands for sidereal hour angle. it is the angle westward from Aries to the star.

Azimuth Zn is the true bearing from the assumed position to the body and its G.P.

The local hour angle (LHA) is the distance the body (and its G.P.} is west of your position, measured in degrees.

 

LOCAL APPARENT NOON (LAN): The time when the sun and the vessel are on the same meridian.