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How To Use Plastic Sextants


David Burch

An ebook edition is included with the online celestial course.

There is a typo on page 91. End of glossary entry for "Refraction," should read: "(10’ at 5°, then 5’ at 10°, and 1’ at 45°) in normal temperature and pressure."

There is a typo on page 8. Second paragraph, first sentence should read: "The next step is to adjust the tilt of the horizon mirror to move the two stars together horizontally."

Article on Solar Index Correction.

Download (Windows only) elibra ebook copy (requires a serial number) — if needed, Download Elibra ebook reader

• Read About Online Celestial Nav Course

• Check out our Comparison of Plastic Sextants

Source for small order of Baader Solar filters. We are told this link sells 1.25" circle of Baadar filter material for only $4.00, $1.00 S/H. Otherwise it is some $40 for a letter size sheet plus shipping. This material is recommend in the book for making sun shades for doing accurate solar index measurements.

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• Read Public Discussion of Celestial Navigation. You can read what others have asked about, but to post your own question you will need a WebCard.



Sextants available from Starpath