Muhamad Gina Nugraha, Raden Giovanni Ariantara, Annisa Nurjanah, Harbi Setyo Nugroho, Judhistira Aria Utama, Duden Saepuzaman, Hana Susanti, Fitri Nurul Sholihat, Anggi Hanif Setyadin, Kartika Hajar Kirana
This study was conducted to determine the change in the earth's surface gravity field (g) during the total lunar eclipse (TLE). Data were collected in Bandung, Indonesia with coordinates of 6 ° 51' 48" S, 107 ° 35'40" E on January 31, 2018 with time duration from 05:36 p.m. to 10:53 p.m. local time, and on July 28, 2018 with time duration from 11:58 p.m. to 06:26 a.m. local time. The surface gravity field of the earth is determined by using a pendulum that is optimized with nylon straps to prevent the rotation of pendulum itself, the use of mirror boards to identify and eliminate pendulum conic motion, and video analysis using Tracker to determine pendulum oscillation period more precisely. The results showed a decrease in the value of the earth's surface gravity field at the peak phase of the total lunar eclipse in both eclipse phenomena, with average of g = 9.7236366301 m/s2 on 31 January 2018 and g = 9,7692416374 m/s2 on 28 July 2018. This trend of a decrease in earth's surface gravity field is consistent with one study result obtained previously on March 9, 2016 during Total Solar Eclipse (TSE) observation. Based on our results, the alignment of these three main bodies (Sun-Earth-Moon) during eclipse (both solar and lunar eclipses) may affect the measurement of Earth's surface gravity field. © 2020 School of Engineering, Taylor's University.
Departemen Pendidikan Fisika, FPMIPA, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi 229, Bandung, 40154, Indonesia; Departemen Geofisika FMIPA, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang Km 21, Jatinangor, 45363, Indonesia
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