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#11
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Navigation Question #8
On Oct 23, 9:48*pm, "Charles Momsen" wrote:
"Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? *[1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? |
#12
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Navigation Question #8
"Bart" wrote in message ... On Oct 23, 9:48 pm, "Charles Momsen" wrote: "Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? [1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? It depends on the time of year. |
#13
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Navigation Question #8
"Charles Momsen" wrote in message ... "Bart" wrote in message ... On Oct 23, 9:48 pm, "Charles Momsen" wrote: "Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? [1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? It depends on the time of year. Bwahahahhahahahahhahahahhahahahhah! Time of year has nothing to do with where Polaris is seen in the sky. The Earth's axis of rotation is only different with respect to the sun making for seasons, not to the plane of the ecliptic. Duh! Now, had you said something about it depends upon in which epoch you might have had a point because of something called precession of the Earth's rotational axis. I hope this helps. http://image.gsfc.nasa.gov/poetry/ask/q1795.html Wilbur Hubbard |
#14
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Navigation Question #8
Wilbur Hubbard wrote:
"Charles Momsen" wrote in message ... "Bart" wrote in message ... On Oct 23, 9:48 pm, "Charles Momsen" wrote: "Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? [1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? It depends on the time of year. Bwahahahhahahahahhahahahhahahahhah! Time of year has nothing to do with where Polaris is seen in the sky. The Earth's axis of rotation is only different with respect to the sun making for seasons, not to the plane of the ecliptic. Duh! Now, had you said something about it depends upon in which epoch you might have had a point because of something called precession of the Earth's rotational axis. I hope this helps. http://image.gsfc.nasa.gov/poetry/ask/q1795.html Well Neal, strictly speaking Charles is correct,, it is caused by parallax error. Or more correctly, geocentric parallax, for Polaris it's about 0.007",,, not likely that you'd be able to measure it while at sea. Ref: http://www.alcyone.de/SIT/mainstars/SIT000816.htm Hope this helps. Cheers Martin |
#15
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Navigation Question #8
"Marty" wrote in message ... Wilbur Hubbard wrote: "Charles Momsen" wrote in message ... "Bart" wrote in message ... On Oct 23, 9:48 pm, "Charles Momsen" wrote: "Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? [1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? It depends on the time of year. Bwahahahhahahahahhahahahhahahahhah! Time of year has nothing to do with where Polaris is seen in the sky. The Earth's axis of rotation is only different with respect to the sun making for seasons, not to the plane of the ecliptic. Duh! Now, had you said something about it depends upon in which epoch you might have had a point because of something called precession of the Earth's rotational axis. I hope this helps. http://image.gsfc.nasa.gov/poetry/ask/q1795.html Well Neal, strictly speaking Charles is correct,, it is caused by parallax error. Or more correctly, geocentric parallax, for Polaris it's about 0.007",,, not likely that you'd be able to measure it while at sea. Ref: http://www.alcyone.de/SIT/mainstars/SIT000816.htm Hope this helps. Cheers Martin So, you are saying the parallax is seven thousandths of an arc second depending upon where in her orbit around the sun the Earth happens to be (time of year)? I'll give you that but that parallax is too small to make any difference when shooting a Polaris angle. So, my contention that saying it depends upon the time of year is dumb remains true. Momsen must be getting senile in his dotage. Wilbur Hubbard |
#16
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Navigation Question #8
"Wilbur Hubbard" wrote in message anews.com... "Charles Momsen" wrote in message ... "Bart" wrote in message ... On Oct 23, 9:48 pm, "Charles Momsen" wrote: "Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? [1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? It depends on the time of year. Bwahahahhahahahahhahahahhahahahhah! Time of year has nothing to do with where Polaris is seen in the sky. The Earth's axis of rotation is only different with respect to the sun making for seasons, not to the plane of the ecliptic. Duh! Now, had you said something about it depends upon in which epoch you might have had a point because of something called precession of the Earth's rotational axis. I hope this helps. http://image.gsfc.nasa.gov/poetry/ask/q1795.html Wilbur Hubbard You're right - I'm wrong! Learned another new thing today, thanks. |
#17
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Navigation Question #8
"Charles Momsen" wrote in message ... "Wilbur Hubbard" wrote in message anews.com... "Charles Momsen" wrote in message ... "Bart" wrote in message ... On Oct 23, 9:48 pm, "Charles Momsen" wrote: "Bart" wrote in message ... Aside from the Sun, when heavenly body is most useful for determining your latitude? [1 pt] The earth, then Polaris. For the Northern Hemisphere, Polaris is quite useful. How much does it vary from true North? It depends on the time of year. Bwahahahhahahahahhahahahhahahahhah! Time of year has nothing to do with where Polaris is seen in the sky. The Earth's axis of rotation is only different with respect to the sun making for seasons, not to the plane of the ecliptic. Duh! Now, had you said something about it depends upon in which epoch you might have had a point because of something called precession of the Earth's rotational axis. I hope this helps. http://image.gsfc.nasa.gov/poetry/ask/q1795.html Wilbur Hubbard You're right - I'm wrong! Learned another new thing today, thanks. One thing I know for sure, you're not a Gaynz sock! He's never admitted he's wrong - not a single time in his entire wretched life. Wilbur Hubbard |
#18
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Navigation Question #8
"Wilbur Hubbard" wrote in message anews.com... One thing I know for sure, you're not a Gaynz sock! http://www.overtherainbowshop.com/Socks.htm ? |
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