Celestial Navigation Cribsheetfor the 2002 Pacific Cup "All you need to find Oahu is a sextant and this table"
Sextant Reading Sextant Reading
for Makapuu Pt. Light for Makapuu Pt. Light
Latitude, at Longitude, at
Date local apparent noon 6:00 PM PDT
July 18 89-23.5 56-28.2
July 19 89-12.6 56-27.7
July 20 89-01.4 56-27.1
July 21 88-49.8 56-26.1
July 22 88-37.9 56-24.8
July 23 88-25.6 56-23.3
July 24 88-13.0 56-21.7
July 25 88-00.1 56-19.7
July 26 87-46.7 56-17.5
July 27 87-33.1 56-15.0
July 28 87-19.2 56-12.1
July 29 87-05.0 56-09.1
July 30 86-50.5 56-05.7
July 31 86-35.7 56-02.2
August 1 86-20.6 55-58.2
August 2 86-05.2 55-54.0
August 3 85-49.5 55-49.4
August 4 85-33.6 55-44.7
August 5 85-17.3 55-39.6
August 6 85-00.8 55-34.1
August 7 84-44.0 55-28.4
August 8 84-27.0 55-22.3
August 9 84-09.7 55-16.0
August 10 83-52.1 55-09.2
August 11 83-34.3 55-02.2
August 12 83-16.3 54-54.9
Corrections for refraction, semi-diameter and dip are
included.
Index error is not included. Check the zero reading of
your sextant on the horizon.
Assumed height of observer above average wave tops is
2.0 meters.
Be sure to measure the minimum angular distance from
lower edge of sun to horizon, determined by "rocking"
the sextant.
For latitude, a sextant reading less than the value in
the table means you are north of Makapuu (60 miles for
every degree). A larger sextant reading meas you are
too far south.
For longitude, subtract the actual sextant reading from
the value in the table to find distance east of Makapuu.
This is only accurate if you are already at the lattitude
of Makapuu.
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