Quote:
.0553
-0546
......7 min. My SR occurs 7 min. after van's almanac, this means I'm 7 min. further west, my Longitude will get smaller.
The middle of time zone (-9) = 135°E.
Time to Arc conversion: 7 min. converts to ~1° 30'.
...134° 60' (same as 135°)
.....-1° 30'
...133° 30' This is my computed Longitude, however, I know I'm really located just 11 nm east, at 133-41E. 
11 nm is really doable!!! On a good, sunny,
clear day, you can see that far from the tower!!! (22,000 yds) Landfall and harbor lights can be found)
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Quote:
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Time to Arc conversion: 7 min. converts to ~1° 30'.
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I don't understand that too!
360° / 24h = 15° per h = 0.25° per minute = 0°15' per minute
--> per minute, sunrise is late, we're 0°15' more west.
1 minute delay in SR = 15' east-west difference
7 minutes delay = 7*15' =105' = 1°45' east-west difference
How many miles are 1°45' longitude-difference at 30°N ?
Or otherwise: how long ist 1° longitude at 30°N ?
It seems, Don used a formula... (I don't have one in my hands or brain
)
11nm?
But 7 minutes means too:
the 11nm for 30°N will be increasing, if we move up to the equator. Am I right?
Don, please explain!