8: The Nautical Almanac, Finding GHA, LHA, DEC.

1. 8: The Nautical Almanac, Finding GHA, LHA, DEC. Presented By: Mate O

2. Course Outline • Navigational Astronomy Lecture 1 & 2 • Mean Time / Apparent Time Lecture 3 • Time Zones, Zone Description, Chronometer Time Lecture 4 • The Earth, Celestial, And Horizon Coordinate System Lecture 5 & 6 • The Spherical Triangle Lecture 7 • Circle of Equal Altitude Intercept Lecture 8 • Time Diagram, Right Ascension Lecture 9 • The Nautical Almanac, Finding GHA, LHA, and Dec. Lecture 10 & 11 • Instruments For Celestial Navigation Lecture 12 • Sight Reduction of the Sun, Stars, Planets, Moon Lecture 13 - 15 • Plotting and Advancing / Retarding the Assumed Position Lecture 16 • Calculating Time of Meridian Passage (LAN) Lecture 17 • Calculating Latitude at Meridian Passage Lecture 18 • Calculating Time of Sunrise/ Sunset/ Twilight Lecture 19 • Star Shooting Schedule / Pub. 249 Lecture 20 • Azimuth and Amplitudes Lecture 21 – 24 • Polaris – Azimuth and Latitude By Lecture 25 • Star – Finder – Stars, Planets, Selecting the 3 best Stars Lecture 26 • The Complete Day’s Work Lecture 27 & 28

3. The Daily Pages of the Almanac: VI: The Almanac The Daily Pages • Lists the GHA and Declination of Venus, Mars, Jupiter, Saturn, the Moon, and the Sun. • Lists the GHA of Aries, and the SHA and Declination of 57 Stars. • Lists “v” and “d” Values to Assist in Interpolating GHA and Declination. • Lists the Local Mean Time of Sunrise, Sunset, and Twilights From 72°N to 60°S • Lists the Meridian Passage and SHA of the 4 Navigational Planets (Which Assists in Plotting Them on a Rude Star Finder.) • Lists the Time of Meridian Passage of the Sun and the Equation of Time. • Lists the Meridian Passage of the Moon and the Moon’s Phase, and the LMT of Moonrise and Moonset • Lists the Magnitude of the Planets

4. VI: The Almanac The Daily Pages

5. VI: The Almanac The Daily Pages

6. VI: The Almanac The Daily Pages

7. VI: The Almanac The Daily Pages

8. Also Has Tables For: VI: The Almanac The Daily Pages • Altitude Corrections For Refraction, Ht Of Eye Corrections (Dip), And Temperature And Barometric Pressure Corrections. • Star Charts • Polaris Star Tables For Calculating Latitude & Azimuth By Polaris • Lists Of Major And Minor Stars With SHA, Declination, And The Star’s Bayer’s Name • Tables For Interpolating Sunrise, Sunset, And Twilight • Moon Sight Reduction Tables

9. Altitude Correction Tables

10. Star Charts

11. VI: The Almanac Polaris Star Tables

12. VI: The Almanac Increments and Corrections

13. VI: The Almanac Altitude Correction Tables for the Moon

14. VI: The Almanac Altitude Correction Tables for the Sun, Stars, and Planets

15. VI: The Almanac Using The Almanac M To Find Greenwich Hour Angle (GHA) & Local Hour Angle (LHA): Of The Sun: GHA☼ Hour + m&s GHA☼ Total (+e –w) λ Longitude LHA☼ Total East Longitude g G ☼ M West Longitude G g ☼

16. VI: The Almanac Using The Almanac M To Find Greenwich Hour Angle (GHA) & Local Hour Angle (LHA): Of The Moon or Planets: GHA Hour + m&s +or- “v” “v” corr’n GHA  Total (+e –w) λ Longitude LHA  Total East Longitude g G  M West Longitude G g 

17. VI: The Almanac Using The Almanac M To Find Greenwich Hour Angle (GHA) & Local Hour Angle (LHA): Of The Stars: GHA Hour + m&s GHA  Total +SHA SHA GHA  Total (+e –w) λ Longitude LHA  Total East Longitude g G   M West Longitude G g  

18. VI: The Almanac Finding Declination • The Declination of the Body Is Listed for Every Hour of GMT in the Daily Pages. For Stars It Is Listed Next to the Star’s Name and SHA • To Interpolate for Minutes of Declination a “d” Value Is Given Which Gives the Average Rate of Change in Declination Every Hour • The Correction for the “d” Value Can Be Found in the Increments and Corrections Table in the Back of the Almanac. The Correction Is Added If the Declination Is Rising and Subtracted If the Declination Is Falling • The Change in the Declination of Stars From Hour to Hour Is Insignificant So Stars Have No “d” Value

19. VI: The Almanac Finding Declination Example:At 0730 ZT at position 015°00’ W on June 15th Find the Declination for the Following: • Venus • Sun • Hamal • The Moon 0830 GMT 15th June 1981 Venus Sun Hamal Moon Declination 08h N 24° 03.6’ (d - .2) - .1’ N 24° 03.5’ N 23° 22.3’ S15° 22.2’ (d +7.5) + 3.8’ S15° 26.0’ N23°18.6’ (d + .1) + .1’ N 23° 18.7’ The “d” Value Helps Us Interpolate for the Change in Declination for the “30 Minutes”