Japan Geoscience Union Meeting 2016

Presentation information


Symbol O (Public) » Public

[O-02] Poster presentations by senior high school students

Sun. May 22, 2016 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Miwa Kuri(International Research Institute of Disaster Science, Tohoku University), Keiko Konya(Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Kou Yamada(Waseda University)

1:45 PM - 3:15 PM

[O02-P22] Spring and Autumn Equinox : Why is the daytime longer than the nighttime ?

*Kanami Okaniwa1, *Chisa Hasegawa1 (1.Maebashi Girls' High School)

Keywords:Spring and Autumn Equinox , daytime and nighttime

It is said that the length of daytime and nighttime on Vernal equinox day and Autumn equinox day are the same, but actually the daytime is 16 minutes longer than the nighttime. One of the reasons is the detinition of the sunrise and the sunset. The other is the refraction of light that travels in the air. We can't prove the first reason because it is the matter of detinition, so we will prove the second one. We revised the distortion of the photos we took and calculated the angle that the sun moved. But we couldn't get a graph as we had expected. We will make a research on this cause and take the photos of the sun movement on the next Vernal equinox day.