JAKARTA, Deputy Science, Assessment, and Aerospace Information Institute of Aeronautics and Space Agency (Lapan) Prof. Dr. Thomas Djamaluddin said that, until now in the world there is no telescope that can see the moon with a height below 4 degrees.
"The problem with any sophisticated telescopes, both light and twilight new moon on the horizon are equally amplified, so the new moon at low altitude remains difficult to see.
He responded about the existence of differences of opinion in determining the Hijri calendar as a determination of Shawwal, 1 Ramadan, and others, namely the moon wujudul criteria that emphasize only on the reckoning and Rukyat Imkan criteria that require visibility of the new moon in addition to reckoning.
"The height of the new moon of Ramadan is very low at 29, ie below two degrees, then most likely it will fail rukyat see the new moon, so it fulfilled 30 days of Ramadan and Eid should fall on August 31," Djamal said.
Space experts who are also members of the Board and Rukyat Hisab (BHR) is asserted, the light of moon and the evening light from the sun, so the same wavelength and can not be filtered.
There is no technology that can see the hilal (crescent) below 4 degrees, and in theory there was no technology that can adjust the contrast so that the new moon could be more visible than the light of dusk, unless there is a technology that could break the theory.
"Criteria reckoning that is currently used by Muhammadiyah should be repaired, the criteria are too simple," he said, emphasizing the importance of the unification of criteria for determining the date of the Hijra.
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