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

[O02-P49] The try that leads 2nd law of Kepler from observations of the Moon.

*Yuito Ishida¹, *Ko Ichihara¹, *Shota Enya¹, *Yu Katayama¹, *Ayumu Shiraki¹, Masaki Sato¹ (1.GIZAN SENIOR HIGH SCHOOL)

Keywords:waxing and waning of the moon, Orbit of the moon, Kepler's laws

We have tried to study waxing and waning of the moon since 2016.
Last year, we studied the relation between the age of the moon and bright surface ratio.
We also studied the change of distance from the earth to the moon.
As a result, we can have made sure that the change of bright surface ratio is not constant.
We thought this result is because of the 2nd law of Kepler that follows revolution of the moon.
In other words, it is the change of revolution speed.
So we try to study revolution speed from observations of the moon.