This is simple, useful, and you'll have to find these values on watches, so get it down and get it right.
Step 1: Find Value of Celestial Phenomena in Daily Pages of NA
Step 2: Interpolate for DLo.
Interpolate for the difference between your Longitude and
the Longitude of Central Meridian of your time zone. If you assume the value from Daily Pages to be in LMT, adjust for your
distance from Cent Mer. If assuming value to be GMT, correct for entire value of Longitude.
- From your DR position at the time from the Daily Pages, the time of Meridian Passage
you found is in LMT. To find ZT, find your DLo (the distance between you and the central meridian of time zone), and convert
that to time either using your calculator or the arc to time conversion table on the first yellow page in the back of the
-If you are west of your central meridian, add your DLo minutes to time of Meridian Passage. If you
are east of your central meridian, subtract your DLo minutes to time of Meridian Passage.
Step 3: Interpolate for Latitude using tables.
Do this with tables found just behind the
Increments and Corrections pages in the yellow section of your NA.
That's it. You can use this method for Sunrise,
Sunset, and either twilight. Moonrise is a little different and is described elsewhere.