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    Re: An error in Primer of Navigation, 6th Edition, diagram at bottom of page 362??
    From: Greg Rudzinski
    Date: 2013 May 26, 19:42 -0700

    Alan,

    The Rude star finder isn't meant to be exact but just good enough to get approximate altitudes and azimuths for the sake of planing morning and evening twilight star selection. The templates are in 10° latitude increments which will cause differences if at an in between latitude. Stars also move over time so the older star finders will be a bit off compared to a current edition. If you want better precision for star finding and selection then use the selected stars from Pub 249 for twilight local hour angle of aries at your current latitude. The USNO web sight is even better yet giving a listing of every body that is visible for the selected UT time and location.

    Greg Rudzinski

    An error in Primer of Navigation, 6th Edition, diagram at bottom of page 362??
    From: Alan S
    Date: 2013 May 26, 16:23 -0700
    Picked up a copy of the above mentioned at the Wooden Boat Show, Beaufort North Carolina, and noticed, whilst playing around with my Rude Star Finder (2102D), the following seeming errors.

    Capella is listed at an altitude of 40 North, Azimuth of 314. I get, looking at my 2102D an altitude of 40 Degrees, Azimuth 0f 305 Degrees.

    Betelgeuse is listed as Altitude 32 Degrees, Azimuth 251 Degrees.I get an Azimuth of 257 Degrees. Altitude is about as listed. Has anyone else ever noticed this, or was there ever been an error sheet printed? Am I making mountains out of a couple of grains of sand.

    We spent a month at Emerald Isle,conditions were not so good for sextant shots, fair amount of rain and cloud, fuzzy horizon. Could not seem to get any evening star shots, horizon was to dark when stars came out, such is life.

    I'm curious as to height conflict between the book data and what I got from my 2102D.
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