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I and my wife will be spending Shabbat Hagadol (this year the 31st of March) on a ship. The evening before the ship will be leaving one of the more northern ports of Norway, and navigating through fjords on that Saturday before emerging just north of Trondheim as the sun goes down. The internet says that three stars will be visible from Hammerfest at 9:29pm, after a sunset longer than is halachically thought possible. But I am also aware of the halachic indecision when it comes to observance of the Jewish calendar in the polar regions. So specifically, what times do I observe when the ship leaves port on Friday evening (in the polar region), whether or not I know my ship will be traveling far enough south to make a halachic difference on Shabbat?

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closed as too localized by msh210 Jan 23 '12 at 17:57

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

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DJRosenschein, Welcome to judaism.SE and thanks for the fascinating question. Please note, though, that this site is not meant for practical halachic guidance; a competent Rav must be consulted. Because of this, it is preferred that halachic questions be phrased theoretically. Answers will contain information and sources useful in making halachic decision, but no actual halachic decision. That said, enjoy the site, and hang around to ask/answer more questions. –  jake Jan 23 '12 at 17:12
    
DJ Rosenschein, per jake's excellent comment, do you think you could reword your question to be relevant to a more general scenario? I am closing it as a temporary measure until that's done; comment here with @msh210 after you've generalized it and I will be glad to reopen it. –  msh210 Jan 23 '12 at 17:56
    
Related to but not duplicate of judaism.stackexchange.com/questions/7182 and judaism.stackexchange.com/questions/8282. –  msh210 Jan 23 '12 at 17:59
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So a better, more general wording is this: How does one figure out the timing of Shabbat on a boat north of the Arctic Circle? –  DJ Rosenschein Jan 23 '12 at 18:20