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How to Determine the Time of Sunrise, and Sunset,..., Continued
d
l
(time)
LMT
11.
12.
Enter the Arc to Time
Conversion table on the left
column, finding the time value
for 5° (20m) and then enter the
right column for 34' (2m 16s)
and add the values together for
the total time correction.
LMT = Corr LMT + or -
d
l
(time)
IF...
THEN...
DR
l
is less
Subtract d
l
than STD Mer (time) from
Corr LMT
DR
l
is greater Add d
l
(time)
than STD Mer
to Corr LMT
d
l
(time)
22m 16s
Round off to closest
minute.
Corr LMT
1827
d
l
(time)
-22
LMT = 1802
How to
To find the time of twilight, use the same steps you use to find the time
Determine the
Time of Twilight
of sunrise or sunset except use the tab values from the twilight column. It
is helpful in some operations to know the exact time of twilight.
Finding the
Time of
Moonrise or
Moonset
Use strip form 3530/39 to find the time of moonrise or moonset. The
procedure is exactly the same as the one used to find the time of SR or
SS except that an additional correction must be made from table II of the
Nautical Almanac. A correction for the time difference between tab LMT
and the preceding or following day must be applied from table II. Simple
instructions for this correction can be found at the bottom of table II.
6-9
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