MUST: Journal of Mathematics Education, Science and Technology Vol. 6, No. 1, Juli 2021 Hal 121-132 DOI: http://doi.org/10.30651/must.v6i1.7547 121 PENGUKURAN DIAMETER DAN KEDALAMAN KAWAH BULAN Muhammad Hidayat* 1 , Leo Hermawan 2 , Riskiyan Hadi 3 , Hariyadi Putraga 4 , Arwin Juli Rakhmadi Butar-Butar 5 1, 2, 3, 4, 5 Observatorium Ilmu Falak, Universitas Muhammadiyah Sumatera Utara dayatc4@gmail.com *1 , leohermawan40@gmail.com 2 , rizkiyanhadi8897@gmail.com 3 , hariyadiputraga@gmail.com 4 , arwinjuli@umsu.ac.id 5 *Corresponding Author Received 27 February 2021; revised 17 July 2021; accepted 29 July 2021. ABSTRAK Penelitian ini merupakan penelitian eksperimental yang dilakukan dengan tujuan untuk mengukur secara tidak langsung diameter dan kedalaman kawah bulan yang diperoleh saat pengamatan Bulan. Penelitian ini dilakukan di Observatorium Ilmu falak Universitas Muhammadiyah Sumatera Utara dengan menggunakan teleskop William Optics Gt 102, Mounting iEQ45 Pro Kamera CCD QHY 5-II dan Canoon 600D. Penelitian ini fokus pada pengamatan kawah di Bulan, menentukan ukuran diameter dan kedalamannya pada basis foto dan perhitungan sederhana dengan beberapa penyederhanaan matematis. Berdasarkan hasil yang diperoleh dari penelitian, didapat nilai untuk diameter () dan kedalaman (ℎ) untuk kawah bernama Tycho yaitu  = 102,95; ℎ = 6,6. Copernicus  = 110,14; ℎ = 5,4. Schiller  = 28,98; ℎ = 8,6. Kepler  = 178,82; ℎ = 3,8 dengan tingkat kesalahan pengukuran 2%. Kata kunci: bulan, diameter, kawah, kedalaman. ABSTRACT This research is an experimental study conducted with the aim to measure the diameter and depth of the moon obtained when observing the Moon. This research was conducted at the Observatory of astronomy at the University of Muhammadiyah North Sumatra using the William Optics Gt 102 telescope, Mounting iEQ45 Pro CCD Camera QHY 5-II and Canoon 600D. This research focuses on observing the crater on the Moon, determining its diameter and depth based on photographs and simple calculations with some mathematical simplifications. Based on the results obtained from the study, obtained values for diameter ( ) and depth (ℎ) for the crater named Tycho namely  = 102.95; ℎ = 6.6. Copernicus  = 110.14; ℎ = 5.4. Schiller  = 28.98; ℎ = 8.6. Kepler  = 178.82; ℎ = 3.8 with a measurement error rate of 2%. Keywords: moon, diameter, crater, depth.