ISRN-UHAMKA used an SQM to collect the sky-brightness data in two different places in Yogyakarta on May 5 and 6, 2018. The data collection took place in two different places, Krakal Beach and Panguk Hill when the moon phase was a waning gibbous moon, only 4-5 days after the full moon.
The estimated dips from the SQM data on these two days were -16.7 degrees and -15.1 degrees, in spite of the fact that the sky was highly light polluted. The illuminated parts of the moon were 78% and 70% respectively. The above-mentioned dips are much deeper than the average dip of -13.3 degrees estimated from 206 days of the SQM data.
To verify the results, we used a high-resolution DSLR camera Nikon D5100 capable of producing an image with more than 16 million pixels. Some image processing techniques confirm the presence of the SQM's dawns. Therefore, the present Fajr call is really too early. Please, check the enclosed video.
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