357 , 2018-02-15 , 鳴門教育大学 , Naruto University of Education
In these days, streets of cities and towns are flooded with various lights. These lights provide convenience and security to night time activities. On the other hand, these lights also cause a problem called “light pollution,” by washing away dimmer stars in the sky. As a result, it is difficult to observe even some well-known constellations in the midst of a huge city. In this paper, we first summarized how to measure the sky brightness by naked eye and using a special tool, Sky Quality Meter(with Lens ; SQML) and what kind of standards are used world-wide. Then, we measured the actual sky brightness in the April of 2016 at a suburb of Tokushima city from sundown till after midnight. We found the SQM-L is very easy to use for people at any age. By observing two nights with 4days apart, we also found the effect of light from the Moon is somewhat significant. But for both days, we found the sky brightness changes about 1.5-2.0 mag arcsec-2during our observations. In the future, we would like to propose further observation to figure out how moonlight affects the “light pollution” as well as the two-dimensional spread of it across Tokushima city, which can be conducted as a part of Environmental Education for primary and junior high school in this area.