PEER REVIEW_The moon phases influence on the beginning of astronomical dawn determination in Yogyakarta

Raisal, Abu Yazid and Pramudya, Yudhiakto and Okimustava, Okimustava and Muchlas, Muchlas (2017) PEER REVIEW_The moon phases influence on the beginning of astronomical dawn determination in Yogyakarta. INTERNATIONAL JOURNAL OF SCIENCE AND APPLIED SCIENCE: CONFERENCE SERIES.


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In astronomy, there are three types of dawn. They are astronomical,
nautical, and civil dawn. The sunlight is starting to appear on the east horizon when
the Sun altitude is 18o
below the horizon. Hence, there is a change on the sky
brightness. The sky brightness can be affected by the moon phases. The sky
brightness level is monitored by Sky Quality Meter (SQM). The SQM was
installed upward to the zenith. There are 4 locations of measurement in
Yogyakarta. The data has been collected for nine months to obtain the complete
moon phases. The beginning of astronomical dawn is time when the sky brightness
level is starting to decrease. The moving average algorithm was employed to
determine the beginning of astronomical dawn. The time when the astronomical
dawn begins is compared with the sun altitude calculation. The sun altitude
calculation has been done using accurate times software. The difference of the
beginning of astronomical dawn by measurement and calculation are 18.61±6.81
minutes, 19.12±3.28 minutes, 31.12±7.76 minutes, and 27.24±8.04 minutes, on the
new moon (0), on the first quarter (0.25), on the full moon (0.5) and on the last
quarter (0.75), respectively. The weather condition is also contributing to the

Item Type: Other
Keyword: astronomical dawn, moon phases, sky brightness, Sky Quality Meter
Subjects: Q Science > QB Astronomy
Divisi / Prodi: Faculty of Teacher Training and Education (Fakultas Keguruan dan Ilmu Pendidikan) > S1-Physics Education (S1-Pendidikan Fisika)
Depositing User: M.Pd.Si. Oki Mustafa
Date Deposited: 10 Dec 2022 03:13
Last Modified: 10 Dec 2022 03:13

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