NavList:

The attached PDF shows the altitude of the Sun as viewed from Ediz Hook (48° 8.5' N 123°  26' W) on May 27 2006.  I use graphs like this which illustrates the length of day light & twilight as viewed from a specified position and date to illustrate to my students how these times varry through the year from a specified position. This graph was produced by my Excel Celestial Navigator Workbook that I use in teaching my USPS JN & N classes. The Celestial Navigator workbook version 12.5 cam be downloaded from:

https://www.uspsd16sg.org/officers_tools/celestial_navigator.xlsm

The Celestial Navigator Workbook contains the following worksheets:

■  Nav Bodies .. GHA, Dec & other data for Sun, Moon, Planets & Stars for a given date, time & position

■  Sight Planning .. Help in selecting sights for a two or three body fix

■  Sight Averaging .. Shows a graph of up to 10 sights and allows bad sights to be removed

 ■  Sight Reduction .. Using Law of Cosines Method +NASR +Time Diagram +Meridian Diagram

■  SR 96 .. Sight Checker for USPS Form SR96

 ■  SR by DC .. Sight Reduction by Direct Computation, Nautical Almanac pages 277--> 285

■  Hs to Ho .. Calculating Ho from Hs, Nautical Almanac pages 280 & 281

 ■  Moon Ha to Ho .. Nautical Almanac Moon Altitude Corrections

 ■  Meridian Transit .. Latitude by Sight on a body at meridian transit

■  Polaris .. Latitude by Sight on Polaris, Nautical Almanac pages 274 & 275

■  24 Hc & Zn .. A graph of the Sun's Altitude and Azimuth vs Zone Time for a given date & position

 ■  Analemma .. A graph of the Sun's Declination vs the Equation-of-Time for an entire year

■  NAV Coordinates .. Celestial Navigation Coordinates & the Celestial Sphere

■  Yellow Pages .. Nautical Almanac Increments & Corrections

 ■  DR 2 Body Fix ..Two Body Fix,  from a DR position

■  AP 2 Body Fix .. Two Body Fix, from an assumed position

■  DR 3 Body Fix .. Three Body Fix, from a DR position

■  AP 3 Body Fix .. Three Body Fix, from an assumed position

■  Set & Drift .. Calculates set & drift +Track & SMG + Course to Steer & SOA

 ■  60 D ST .. Speed, Time & Distance calculations

 ■  Interpolation & Data Conversions

■  Arrival Coordinates .. Calculated using mid-latitude sailing equations

■  Course & Distance .. Calculated using rhumb line equations

 ■  Great Circle Route .. Calculates Great Circle Distance and initial course heading

■  Rhumb Line .. Distance vs. Great Circle Distance

■  Tides .. Rule of 1/12 for Tide Prediction

Ron

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