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My comment was on several ad hominem atttacks by one person , and I quoted one of them . Possibly , it is for every day practice not the most used fashion to check a position by sunset-sunrise ephemeris , but it is an acceptable method in case of emergency , or in case of only having the sun available . As such the operation is mentioned and described in several textbooks on navigation . Having been used , yes or no , is at best a question of relevance . An error of logic is a systematic fault in calculation or mathematics which leads to inconsistency . In such event the theory is erroneous , or incorrect . I have up to now not received any message mentioning inconsistency , but if you have one as you suggest , please let me know .
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