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Can the flat-earthers measure any area, like a football field -- or a lake, like Lake Tahoe or Lake Erie?
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Maybe not. They might be averse to measuring area because of emotional problems with it.
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Yesterday I measured the angle between the sun and quarter moon again. This time it was much easier to do. The sun set at just 8 minutes before the minute the Almanac has for the First Quarter in my time zone ( 7:48 pm ). So I was able to measure the angle very easily 45 minutes in advance. It was so close to 90 degrees I couldn't tell how much off it was, more or less than 90. I took several readings and they were all right at 90 degrees. I used a plumb line, and it split the moon right in half at the line of light/dark sides, and the line (on the moon) was perfectly plumb, which was very interesting to see first hand.
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As I was doing this exercise, it occurred to me that my time zone is several hundred miles wide, but the minute for the First Quarter is the same for the whole zone. I checked the next time zone over (east) from me and found that the First Quarter moon was listed at just 60 minutes later, which means that the first quarter occurs less than one minute different in these two time zones. OR else, the moment the moon reaches its First Quarter has no bearing on what time zone the observer is in, and it will be the same minute all over the world (adjusted for time zone). The Old Farmer's Almanac does not provide First Quarter time (or any other times) for Greenwich England (UTC) because it's not in the continental USA. So I checked Miami, Florida and found 10:48 pm, which is the same minute as in Los Angeles, adjusted for time zone.
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Therefore, it appears that the moon reaches its First Quarter at a moment in time, regardless of from where on earth one is viewing it. That's something to think about.
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Take the "flat earth" precept for a moment, with the sun and moon making inexplicable squibbles around the north pole. With the sun at 90 degrees from the moon viewed from Los Angeles, would it also be 90 degrees from the moon when viewed from Miami? And would the moon reach its First Quarter at the same minute in California as it does in Florida?
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Obviously not.
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So this poses a huge problem for the flat-earthers, and we have not even started to deal with the 90 degree angle I keep getting between the sun and moon at the First Quarter.
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For the record, I observed the angle of repose of the moon yesterday. As I described above, it was very much at 90 degrees from the horizontal at 7:30 pm, when the moon was just about to achieve its First Quarter, and the moon was directly overhead at astronomical high noon, as I had expected it would be.
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Now, considering the data from Miami, I have no reason to expect that someone there would be seeing anything different from what I see here, that is, the angle of repose of the moon would be 90 degrees from the horizontal in Miami, too, and the moon would be located at astronomical high noon from Miami, both of which make utterly no sense with the sun and moon conforming to the flat-earthers' dictum of 3,000 miles above the earth and whirling around like a slow motion tornado, at once a day.
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