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1,341. If the Moon is Never Seen
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Hilchos Kiddush HaChodesh 18:6 (Continued from halacha 18:5) The court count 29 days from Rosh Chodesh of the second month but the moon is not seen. If you think that a day should again be added to the month so that Rosh Chodesh of the third month will be the 31st day, as it was […]
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1,340. Considering the Season and Location
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Hilchos Kiddush HaChodesh 18:4 The court should always consider two things: the season when the moon was seen and the location. They should ask the witnesses where they were when they saw the moon because when the arc of visibility is small, there is only a small window in the moon will be seen. Let’s […]
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1,339. More Visible in the Winter
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Hilchos Kiddush HaChodesh 18:2 The visibility of the moon will be greater on a clear day in the winter than it is in the summer. This is because on a clear winter day the air is clearer and the skies are brighter thanks to an absence of dust in the air. In the summer, the […]
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1,337. The Exacting Process to Acquire Our Data
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Hilchos Kiddush HaChodesh 17:22 If we wanted to know about the arc of visibility for Friday night, 2 Iyar of the (Rambam’s) current year, we would calculate it at 11 degrees, 11 minutes, as was already discussed (in halacha 17:14). Since the arc of visibility is between 10 and 14 degrees, we must examine its […]
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1,336. An Arc of Visibility from 12 to 14 Degrees
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Hilchos Kiddush HaChodesh 17:20 If the arc of visibility is between 12 and 13 degrees, or greater than 13, and the first longitude is 10 degrees or higher, the moon will certainly be visible. If the arc or the first longitude is smaller than this, the moon will not be visible. Hilchos Kiddush HaChodesh 17:21 […]
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1,335. An Arc of Visibility from 10 to 12 Degrees
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Hilchos Kiddush HaChodesh 17:18 If the arc of visibility is between 10 and 11  degrees, or greater than 11, and the first longitude is 12 degrees or higher, the moon will certainly be visible. If the arc or the first longitude is smaller than this, the moon will not be visible. Hilchos Kiddush HaChodesh 17:19 […]
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1,334. Visibility Limits
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Hilchos Kiddush HaChodesh 17:16 If the arc of visibility is between the start of the 10th degree and the end of the 14th, evaluate the arc’s relationship to the first longitude and determine if the moon will be visible from the bounds that are known as visibility limits. Hilchos Kiddush HaChodesh 17:17 These are the […]
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1,333. When the Arc of Visibility is Small
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Hilchos Kiddush HaChodesh 17:14 Since the moon’s latitude is to the south and its actual location is between the start of Capricorn and that of Cancer, we add the moon’s circuit to the second longitude. This results in a  third longitude of 11 degrees, 28 minutes (11, 28). Since this longitude is in Taurus, we […]
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1,332. Will the Moon be Visible?
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Hilchos Kiddush HaChodesh 17:12 Next, go see in which constellation the third longitude falls. If it is in Pisces or Aries, add one-sixth of its value to the third longitude. If it’s in Aquarius or Taurus, add one-fifth. If it’s in Capricorn or Gemini, add one-sixth. If it’s in Sagittarius or Cancer, leave the third […]
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