徳島の星空:定点観測による光害の時間的変化

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Night Sky of Tokushima:

Time Variation of Light Pollution at a Fixed Location

TAMURA Kazuyuki

*

and ANDO Toru

**

(Keywords : Light Pollution, Environmental Education, Astronomy Education)

In these days, streets of cities and towns are flooded with various lights. These lights provide conven-ience 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 ; SQM-L&and what kind of standards are used world-wide. Then, we measured the actual sky brightness in the April of#!"&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 $days apart, we also found the ef-fect of light from the Moon is somewhat significant. But for both days, we found the sky brightness changes about""%)#"!mag arcsec)#during our observations. In the future, we would like to propose fur-ther 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 pri-mary and junior high school in this area.

*Basic Human Science for Integrated Studies, Naruto University of Education

**Planetarium, Asutamuland Tokushima

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