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The Gemara in Chagiga 16a mentions not staring at a rainbow (for too long). It represents (is similar to?) the glory of Hashem and (along with not staring at the king) is considered disrespectful to enjoy the view. כל שלא חס על כבוד קונו רתוי לו שלא בא לעולם: מאי היא ר' אבא אמר זה המסתכל בקשת רב יוסף אמר זה העובר עבירה בסתר מסתכל בקשת דכתיב {יחזקאל א-כח} ...


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From Jewish Time-Zemanim Definitions Netz HaChamah (Sunrise) = When the center of the sun is at a 0.833 degrees depression angle below the horizon ... Shkias Hachamah (Sunset) = When the center of the sun is at a 0.833 degrees depression angle below the horizon The US Naval Observatory define sunrise/sunset as follows (in their FAQ): Many ...


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Once I wrote a program that calculates the halachik times for some specific cities in diaspora. And I was commanded by the R. Refoel Antin to calculate the time when the sun is completely below the horizon as a time of shkiya. Same about the sunrise. It is the time when the sun begins to appear above the horizon. The wiki page about sunrise says: ...



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