Errata for
Celestial Navigation
: A complete Home Study Course, 2nd edition

Applies to 8th printing of second edition.


Page 1 refers to a "Calendar Section" of our website. That calendar no longer exists.


Third paragraph of Section 3.5, sentence should read, "Then figure your latitude from the reasoning given in the last section, which is always the sum or difference between z and Dec."


In Exercise 4.3 (2), the result should be a near-equilateral triangle with sides of 31 to 32 nmi long.


Change "Turn to the back of Pub. 249 to find Table 5." to "Turn to Table 5 in Pub 249 (front of PDF copy; back of the print copy)."


Figure 5.3-9, The course used in this plot is just an example of what it might be. It was not mentioned earlier.  First paragraph should read: 

Figure 5.3-9. Plotting the LOP for Sun Sight #1 on the same sheet that we plot the DR track, which we would have learned from logbook records (not covered here) was course 056. The label AP (assumed position) is a-Lat, a-Lon. We know from this one sun sight that we are somewhere on that line, but we must be careful to go beyond that.


4th paragraph, left column, reword as: Find the declination of the star in the star column on the Daily Pages. The stars are listed alphabetically with the declination given beside each star. For stars there is no d value or d-correction on a daily scale, although some do change positions very slightly over the year. For any of the three days on each Daily Page, you use the same star column for declination. (The very small declination drifts over the year can be seen in the extra star list in the back of the Almanac.)


The Lat, bottom right of the page, should be 29° 9.9' (Taking into account the interpolation of LHA minutes.)


The top right reference to T-14 should be T-13.


Moon-sun running fix. If you check the DR locations, you will see these sights are actually over land, mountains even. You can just imagine them as being all over water, and just work then as is for practice (their original goal), or convert them to actual land sights using a bubble sextant. Read about this option at:;f=16;t=000389


Figure 9.10-2 Add to the caption that this is a view of the stars looking south.


Corrected Exercise answers using Table 11.15 (The Ho max values are correct as listed):
1. 30.4°
2. 62.4°
3. 52 min (from sight recxution tables or extrapolate Table 11.15)
4. 34.3 min
5. 8.6 min


In step 6, reference to F-bar should be F°


Glossary on Lat by Polaris, states that this is only nav technique described in the Almanac, but this is not strictly ture. In Sec 11 of page 282 they give a formula for Lat and Lon based on measured Ho and computed Hc. Rather complex, but it is there, so our statment requires more clarity.


Answers to Lat by Polaris may be off a few tenths as not all were interpolated for a0. It is best to interpolate.