Altitude Corrections, Continued
The OPNAV Strip Form 3530/30; H.0 229; Nautical Almanac are used
to reduce sights for stars, planets, the Sun, and the Moon. The altitude
corrections for each are the same except an additional correction is
required for the Moon and planets. Reducing sights using this strip
form is a process that can be broken down into the following stages:
Applying altitude corrections to find Ho (height observed).
Using GMT to find LHA to enter Pub 229 with.
Finding True Dee to enter Pub 229 with.
Entering Pub 229 to find total corrections to apply to Ho to find
Hc (height computed) Intercept, and Zn.
Steps to Follow Use the following table to find Ho for any celestial body. Since we will
to Find Ho
be working several example problems, refer back to this table to find
Example problem to find Ho
Pub 229 Naut
Enter the symbol of the body.
Enter the GMT of the actual sight.
09 15 38
Enter the value of the index correction.
Enter the dip correction (height of eye) from
the inside cover of the Nautical Almanac.
Total the IC and D correction.
Enter the uncorrected sextant altitude from the
Apply the sum to hs.
Use ha to enter the altitude correction tables of
the Nautical Almanac.
Add any additional corrections for the Moon or
Apply altitude and add'l corr to ha.