Simulator Posisi Matahari dan Bulan Berbasis Web Dengan WebGL
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Keywords
Abstract
Moon as a satellite of the earth has an important role for the life of the earth. Apart from being a source of illumination, moon also has an effect on the earth both on land and at sea. The influence of the moon to the earth relate to the its position. This research aims to create a simulator of the sun and moon position to the earth based on the time and location of the observation. This simulator is web-based and made in 3-dimensional (3D) using webGL technology. The position of the sun and moon expressed by latitude and longitude which is a position that is passed by the line connecting the earth to the sun or the line connecting the earth to the moon. The position of the sun and moon obtained from calculations based on previous research. Once the position is known, the earth, the sun, and the moon then described as a 3-D model. The position of the camera can be moved by dragging a web page so that the sun, earth, and moon can be seen from various positions. The camera always leads to the center of the earth to avoid user errors flipping the camera which causes the object is not visible.
Keywords: sun, earth, moon, declination angle, moon phase, time systems, delta T, webGL
Abstrak
Bulan sebagai sebuah satelit bumi mempunyai peranan penting bagi kehidupan bumi. Selain sebagai salah satu sumber penerangan, bulan juga mempunyai pengaruh bagi bumi baik di darat maupun di laut. Pengaruh bulan terhadap bumi berhubungan dengan posisinya. Penelitian ini bertujuan membuat simulator posisi matahari dan bulan terhadap bumi berdasarkan waktu dan lokasi pengamatan. Simulator dibuat berbasis web dalam 3 dimensi (3D) dengan menggunakan teknologi webGL. Posisi matahari dan bulan dinyatakan dengan lintang dan bujur yang merupakan posisi yang dilewati oleh garis yang menghubungkan bumi dengan matahari atau garis yang menghubungkan bumi dengan bulan. Posisi matahari dan bulan didapatkan dari perhitungan berdasarkan penelitian sebelumnya. Setelah posisi tersebut diketahui, bumi, matahari, dan bulan digambarkan sebagai model 3 dimensi. Posisi kamera dapat dipindahkan dengan men-drag halaman web sehingga matahari, bumi, dan bulan dapat dilihat dari berbagai posisi. Kamera selalu mengarah ke pusat bumi untuk menghindari kesalahan pengguna memindah-mindahkan kamera yang menyebabkan objek tidak terlihat.
Kata kunci: matahari, bumi, bulan, sudut deklinasi, fase bulan, sistem waktu, delta T, webGL
References
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