کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7211377 | 1469255 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pseudo dawn and true dawn observations by naked eye in Egypt
ترجمه فارسی عنوان
سپیده دم و مشاهدات واقعی سپیده دم با چشم غیر مسلح در مصر
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کلمات کلیدی
سپیده دم سپیده دم مشاهدات چشم برهنه،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
چکیده انگلیسی
Naked eye observations of the morning twilight phenomenon, beginning, end of a pseudo dawn and the true dawn are recorded. These results are an average of 38 observations carried out at Wadi Al Natron (30° 30â² N, 30° 09â² E) with a desert background during the years 2014-2015. These observations enabled us to get an average depression of the sun below the horizon of about 19.74° (begin of zodiacal light), 15.41° (end of zodiacal light) and the beginning of twilight (true dawn) is 14.57° (The highest value of confidence, meanâ¯+â¯1SD) which lies in a range between (12.48°â¯â¤â¯Doâ¯â¤â¯15.14°). These results show that there is about 5° difference between our obtained value and that currently used in Egypt which is 19.5°. The azimuthally range of observations in the solar vertical direction ranged from 0° to 20°, but this phenomenon was followed from 0° to 10° along the altitudinal range. These results indicate that the currently used angle for calculating dawn in Egypt is the first zodiacal light (pseudo dawn) and not true dawn.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Beni-Suef University Journal of Basic and Applied Sciences - Volume 7, Issue 3, September 2018, Pages 286-290
Journal: Beni-Suef University Journal of Basic and Applied Sciences - Volume 7, Issue 3, September 2018, Pages 286-290
نویسندگان
M.A. Semeida, A.H. Hassan,