LAW OF THE USE OF LIGHT CONTRAST PHOTOMRY OF HILAL VISIBILITY TO DETERMINING THE EARLY MONTH

Abstract

In making observations (rukyat al-hilal) humans use their eyes as detectors. However, the human eye has limitations, where the human eye is not able to capture the very dim light at both ends of the crescent curvature. In addition, the visibility of the hilal (the appearance of the hilal) is also influenced by the twilight light emitted from the sun which has been below the horizon and must know the value of the hilal illumination. Therefore, in this case, humans can take pictures of the new moon using a detector which can be considered as an "extension of the hand" of the eye. Because physically, the appearance of the new moon can be analyzed using various reliable and precise technological devices. One of them is by using photometry. The law on the use of tools to perform rukyah, the scholars are divided into two opinions. On this issue, Imam Ibn Hajar did not allow merukyah with technological tools, or merukyah using water reflections or glass surfaces. telescope, water, ballur (white object like glass) can still be considered as rukyah. Al-Mu'thi asserted that the use of optics is a helper because it is the eyes of the perukyah themselves who make the assessment of the new moon. As explained above, light contrast photometry also plays a role in the rukyatul hilal procession where the program is able to detect the dynamic presence of the new moon. The simple procedure of recording the presence of the new moon captured by the lens can be processed so that the image of the new moon can be seen.