The Analysis of the 2019 Annular Solar Eclipse with simple instruments for Developing Student Worksheet
Cahyo Puji Asmoro, Arief Rizqiyanto Achmad

Universitas Pendidikan Indonesia
Kangwon National University

Abstract

The annular solar eclipse occurred when the Earth-Moon-Sun position aligned in the same line where the angular diameter of the moon is smaller than the angular diameter of the sun due to the moon is on the farthest distance with respect to the earth. The event was observed on 26 December 2019 at Siak Regency, Province of Riau, Indonesia. Based on that event observation, the sun are gradually covered by the moon until the peak event where the sun are completely covered and showing ^ring of fire^. All stages of eclipse are captured as an images from DSLR camera that been attached into telescope with specific filter as well as illumination determination from observation location using lux meter during the event. This study explained how to get the information from solar eclipse images available by using image-processing software namely ImageJ so it can be used as a student worksheet. The result shows that the sun is covered by the moon about 93.59% of its area thus showing ^ring of fire^ event accompanied with decreasing brightness value about 47 lux, making the observation location showing a dusk-like event during the peak stage of solar eclipse. The plotting of both pixel area-time graph and illumination-time graph of this study shows a similar trend. Therefore, the data acquired in this study is obtained well so it can be used as a student worksheet in the Astronomical Position lecture based on the actual phenomenon with a simple instruments for observation.

Keywords: Eclipse, Angular Diameter, Illuminance

Topic: Physics Education